Acid Definition and 698 Threads

So I calculated the pH for the two concentrations: pH=4.61 for the high concentration and pH=5.61 for the low concentration. Regarding the dissociation: in the solution manual it is given that the acid is most dissociated at the higher pH than the lower pH, which to me seems strange...

Homework Statement calculate the number of moles of potassium manganate required to neutralise oxalic acid. 2KMn)4- + 5H2C2O42-+ 16H+ --> 2Mn2+ + 10CO2 + H2O Homework Equations n = c x V n= m/Ar The Attempt at a Solution Moles of oxalic acid = 5x10-4 Volumeol of KMnO4 = 0.01085dm-3...

Homework Statement Aluminum metal dissolves in hydrochloric acid. What volume, in mL, of 1.58 M HCl is needed to completely dissolve 3.200 g of aluminum?(Hint: write the single-replacement reaction first) Homework Equations V[1]M[1]=V[2]M[2] The Attempt at a Solution I got the...

Hi, I am trying to determine the conventional cathode and anode designations for lead acid cells. From what I have researched: Anode is where current flows in the device, or where electrons flow out of. In a secondary cell the designations for anode and cathode are based on the discharge...

i was reading through my alkene notes and it said for strong oxidation of alkenes in acidic conditions results in formation of ketone , carboxylic acid or carbondioxide and water. But my notes doesn't detail the mechanism so i found some videos explaining how ketones and carboxylic acid may be...

Homework Statement Hi guys. In the biochemistry chapter, the book shows the structure of a phospholipid (picture attached) with a PO4 3- group and 2 fatty acid chains attached to a glycerol molecule. However, one of the fatty acid chains has a C=C bond while the other is fully saturated. I’m...

Homework Statement In one of my solved problems, 1-cyclopropylbut-4-en-1-ol undergoing ozonolysis followed by workup with H2O2 (without the Zn dust) gave 3-hydroxy-3-cyclopropylpropanoic acid and carbonic acid, instead of methanoic acid. Possible? How?

I put some copper bits into concentrated sulfuric acid. Nothing much happened other than it got shiny and clean looking. So I poured off the acid and then put water on the copper to rinse off the remaining acid, and the copper started bubbling and made a nasty rotten egg smell. Is that...

Homework Statement Which of the following combinations would act as buffered solutions? a. HCl and NaCl b. CH_3COOH and KCH_3COO c. H_2S and NaHS d. H_2S and Na_2S Homework Equations none really... The acid needs to be weak and the base strong though. The Attempt at a Solution HCl is one...

Homework Statement Calculate the pH of a 0.20 M solution of iodic acid ##(HIO_3)##. ##K_a## for iodic acid is 0.17 Homework Equations ##K_a = \frac{[H^+][IO_3^-]}{[HIO_3]}## The Attempt at a Solution ##[HIO_3] = 0.20## M. The concentration of ##[H^+]## and ##[IO_3^-]## should be the same...

I tried looking for my unknown (209.70 g/mol) online and couldn't find it. The closest I found were H4O7V2(217.907 g/mol) and HCl2I(198.819 g/mol), but I know I am correct to a 2.7% accuracy. What other lists can I use to solve this?

I made an account to ask this. I have looked and could not understand any of the formulas I came across. I even looked for calculators, but did not understand how to use them. Milk has a pH of 6.5 to 6.7 (lets use 6.7) And I wish to lower the milk's pH to 4.9 (as an example) How do I...

Homework Statement (Q.) 3 g of activated charcoal was added to 50 mL of acetic acid solution (0.06N) in a flask. After an hour it was filtered and the strength of the filtrate was found to be 0.042 N. The amount of acetic acid adsorbed (per gram of charcoal) is :Homework EquationsThe Attempt...

Hey guys, should the -OH group in glycolic acid be considered a functional group or a substituent due to the presence of the carboxylic acid group?

Hi I am new to the concept of neutralization. My teacher told me that acids do not react with neutral salts. I want to know why not. If both are dissolved in water and both completely dissociate, why can't the ions of acid and salt exchange and perform a double displacement reaction. Moreover I...

Hello, wondering if anyone can confirm if 7% Sodium Hypochlorite and alkyl benzene sulfonic acid are compatible to mix together? Any concerns or reactions to be aware of?

Homework Statement 8.040 grams of a strong, monoprotic acid was added to enough water to make 500 ml of solution and used o completely neutralize 2.080 g aluminum hydroixide. identify the acid. Homework Equations m1v1 = m2v2 M = n/1 Liter The Attempt at a Solution i know that 2.08 g of...

Homework Statement What will result in the reaction of benzene with acetone in sulfuric acid? Homework Equations The Attempt at a Solution Is bisphenyl correct?

Hello everyone, Do somebody know some emulsifiers which I could use to prepare stable oil/water emulsion in acid solution (pH 3-5)? Thanks for your time =)

Hello everyone I am doing some research about carbonic acid in fizzy drinks. I hope to find out how much carbonic acid was in the drink by looking how much CO2 bubbles come loose. but later I thought that there are two reactions that can take place: H2CO3 --> H2O + CO2 H2CO3 --> H+ + HCO3-...

Hello, I have recently realized, that I had just made hydrochloric acid (HCl) (not really concentrated) at home by mixing NaCl with vinegar . I am interested in some experiments than I could easily conduct at home. I am interested in making ions or pure substances. Do you have any advice or...

I know very little about chemistry so not sure if this is possible. I am wanting to find out the kDa from the values given in the fact sheet ( I'm not sure exactly what it can be calculated from but these are the values from the fact sheet ) molecular weight 1.14M bulk density .34g/cm3 limiting...

I am currently performing a school experiment in which I am testing when citric acid decays. We are juicing lemons, filtering them to get a higher concentration of citric acid, placing them in water baths from 10 to 90 degrees Celsius and then titrating them against one mole of sodium hydroxide...

Hi all I got an exercise: Cells were floated in a mass in a solution with 150mM of NaCl (isotonic conditions). A weak acid was added to the solution with a pK of 7.0 and concentration of 50mM in the solution. What is the tonicity and osmoticity of the new solution if PH=4 I know that I should...

I was thinking of a hypothetical waste system that uses nanotechnology to its advantage. At the individual level, waste just passes through into pipes when flushed like it normally does. But once it reaches the water treatment plant there is an initial filter to catch solid waste(in other...

1) Given: 0.100 M NaOH, 5 mL concentrated acetic acid. 30 mL of distilled water was added to dilute the concentrated acetic acid. Calculated: Equivalence point (Vol = 32.5 mL, pH = 9.3) 1/2 equivalence = 32.5 mL/2 = 16.25, pH = 4.4 1. Calculate the concentration (M) of the diluted acetic...

Hi everyone. I'm doing research with sodium alginate (NaC6H7O6) and I really need your help. Sodium alginate is a cell wall component of seaweed or brown algae. During the research, I read some pages telling that we can get alginic acid by dissolve sodium alginate in water. But what I think is...

A chemist needs a 30% acid solution. How much pure acid needs to be mixed with 5 milliliter a of a 10% acid solution to obtain the desired solution? The words PURE ACID for some reason or another point to 100 percent. My equation: 0.30(x) + 0.10(5) = (x + 5) Is this right?

Does anyone know of an etching solution suitable for aluminium and its alloys that does not contain hydrofluoric acid?

If let's say a person accidentally has acid spilled in his hands, if he sprays or reaches for baking soda (or sodium bicarbonate) to neutralize the acd, how fast is the reaction? is it enough to avoid any skin damage? Are these part of any First Aid kit? Just curious about this. I read...

I am trying to create a solution of Chitosan (Low MW) in 1% Acetic acid. I've tried dissolving up to 3gr per 100ml. My problem is that by using extensive sonication, heating (~50 C) and stirring for days the solution is still very thick (very viscous) and you can see particles in it. Any...

Hi, I've bought R-Alpha lipoic acid powder (not sure about its purity). So I mixed 500mg of ALA with 250mg sodium bicarbonate to get sodium lipoate, 30 minutes later (when the reaction is over) I added some 250mg of pure ascorbic acid to the final mixture and some small amount of insoluble...

Homework Statement Identify the reagents you would use to perform the following transformation: Toluene -> Benzoic acid Homework Equations N/A The Attempt at a Solution I'm not exactly sure how I solve this type of thing. I was considering reacting this with an ordinary oxidizing agent, but...

If a protein contains a repetitive region, what might be assumed, and what should be done next to test the null hypothesis? Can anyone answer this with a reliable source they find?

Hi! So I am thinking of doing a concentration of citric acid in a lemon lab, by titrating it against sodium hydroxide. I want my independent variable to be time, and so i plan to do it over the span of 25 days, in which I think it will be long enough to show some change. I'm just unsure about...

Hi! I want to clarify what will happen if you mix two acids. One is stronger and One is less stronger. What will be the pH level result? for example if the acid is the juice from lemon which is at 2.0 be mix with orange ph level of 3.0, will it be greater than less than 2.0? or will it be 2.5...

I got granulated citric acid 99.9% pure Food Grade, my question is which pKa to use in the pH formula since this acid has three pKa values? I am trying to calculate a pH of a certain molar concentration. I appreciate your input. The formula I am using is pH=1/2(pKa-log molar concentration of...

People generally associate Gastroesophageal reflux disease (GERD) with excessive production of hydrochloric acid in the stomach. We know that HCL is essential for proper digestion. In acid reflux the acid comes up the esophagus from the stomach due to the insufficiency of esophageal sphincter...

Homework Statement Write separate equations for each potassium salt (KH2PO4) dissolving in water and for the ionization reaction of the weak acid anion that each of these salts contains. Homework Equations None The Attempt at a Solution I just needed to clarify when it dissolves in water do...

I know that HCl is a compound whose 1 molecule is composed of 1 hydrogen and 1 chlorine atom bonded co-valently to each other, the bond being polar co-valent. It exists in gaseous state at room temperature. When HCl gas is dissolved in water, it dissociates to furnish H+ ions and thus HCl...

Hey guys! So I have this chemistry problem which I'm finding very difficult. QUESTION: You have an unknown triprotic acid, H3X, and have titrated it with 22.53mL of NaOH. The pH of the unknown solution is 2.04 and the concentration is 48.028g/2L. While the concentration of the NaOH is...

Homework Statement To unclog a drain you add 26g of sodium hydroxide to 150mL of water. Calculate the pH and pOH for the solution you prepared. Can someone tell me if I'm doing it right. Homework EquationsThe Attempt at a Solution n = m/M n = 26/40 n = 0.65mol for 0.15L Does this mean that I...

Homework Statement A 50.0 mL aqueous solution of sodium hydroxide has a pH of 12.50. If 36.00 ml of 0.0200 mol/L sulfuric acid is added to this sodium hydroxide solution, what will be the new pH of the resulting solution? Assume that the temperature stays constant at 25C, and that the volumes...

Homework Statement A 3 wt% HF / 12 wt% HCL treatment is injected without an HCL preflush into a sandstone reservoir containing 10% CaCO3. If half of the HF is consumed in reaction with CaCO3 to form CaF2, what will be the next porosity change, considering both CaCO3 dissolution and CaF2...

How can I collect chlorine gas produced by electrolysis and mix it with water to create hydrochloric acid (HCl)? I've tried it several times but the concentration of gas is so low it doesn't even bubble the water in the test tube.

I have been trying to come up with a way to get from some small carbon molecules (C2,C3) to benzene, or its singly substituted friends like phenol, aniline, or benzoic acid. I stumbled upon a trimerization of acetone to mesitylene (3 C3H7O --> C6H3(CH3)3 + 3H2O) which can be oxidized (via...

Its a very simple question . So when the carboxylic acid radical -COOH is standalone in an aliphatic molecule without any other acid or basic radicals Pka would be around 4.5 . But when something like -NH3+ is present in the same molecule the Pka for -COOH changes , even though -NH3+ wouldn't...

Homework Statement Why is ethanol a bad choice for recrystallization of phthalic acid? 2. The attempt at a solution I know phthalic acid is very soluble in water, so water is a great candidate to recrystallize phthalic acid. I also know water and ethanol are not miscible. But I don't know how...

If I'm given the dissociation constant for HF, how would I find the dissociation constant for F-? Thanks in advance.

Homework Statement How much 4.00M of HCl is required to make 100ml of 0.400M HCl? Homework Equations M1V1 = M2V2 The Attempt at a Solution Its (4.00M)*(xL) = (0.400M)(0.100L) I think its 0.005L but the possible answer (multiple choice) say otherwise...