Acid Definition and 698 Threads

Homework Statement Calculate the pH of a solution of L-glutamic acid in which the ionic species with a net charge of -1 is 5 times greater than that of the isoelectric structure. (Refer to pKa Table at end of problem set). Homework Equations pKa for glutamic acid: -COOH = 2.19...

I have a question in my environmental engineering class that goes like this: if 100mg H2SO4 is added to 1 Liter of water, how many milligrams of NaOH (strong base) must be added to neutralize the acid? the answer is 81.6mg, but how do i get to the answer? i tried writing a reaction of...

I am offered Sealed Lead acid batteries at heavy discount (half the price) at local Sale. But they were manufactured some 5 years back. How much damage does long storage do to them? They have never been touched. Just bought 5 years back, and stored.

Are all acid have covalent structure in solid state?

So how do you know when a chemical is an acid or not? I know that an acid is a compound that, when dissolved, yields H atoms, but does that mean than any compound with H in it is (or has the potential to be) an acid? For example: HNO2, I put down that it was Hydrogen Nitrite, but the...

Is SiO3 soluble in Hydrofluoric acid? Is SiO3 soluble in Hydrofluoric acid? Why am I asking this: I have some crystals of Be3Al2(SiO3)6 - Beryl and there are structural channels which I want to enlarge...! (I know it sounds impossible) Here is how the crystal's structure looks like...

Electroplated a 5 micron layer of copper a few days ago. Was wondering why there's sulphuric acid in the solution.

Hi Guys, Citric acid has three different values for pKa because it is a polyprotic acid. I am aiming to make a buffer solution with sodium citrate but I am not sure which pKa value to use in the Henderson-Hasselbalch equation. Does anyone have any ideas?

I have been trying to work this out over 2 days now and I just don't understand! The side chains of Aspartic acid and Glutamic acid both have the reactive group COO-. I don't understand how the COO- is an acidic group! To me, I can see how it could be a basic group - the H+ binds to the COO-...

Homework Statement Given 250ml of 0.1M HC3H5O2 (Ka=1.35E-5) What volume of a)1.0M HCl is needed to lower the pH to 1.00. b) 1.00M NaC3H5O2 raise pH to 4.00 Homework Equations pH=pKa-log (HA/A) ICE chart The Attempt at a Solution I used the ice chart for the dissociation of...

Why does ascorbic acid change in concentration over time?

I want to charge a led-acid battery it needs 12V DC 1.i have transformer to convert 220V AC to 12V AC after that can i give 12V AC to bridge rectifier and from bridge rectifier to battery terminals directly or should i use a filter to remove the fluctuations in DC ? 2. what should be the...

Does stearic acid do bad things for the human body? Apparently stearic acid is in most vitamins if you take vitamins, it says it in the ingredient list, most people until now it seems did not even know that it is bad for you, but no other article anywhere else on the web says this except for one...

Hi guys, I just have a quick query about the mechanism of action of salicylic acid. I have tried in vain to find a solution elsewhere, but have not had any luck. How exactly does salicyclic acid work. As far as I can tell, it doesn't have an acetyl group, which is how aspirin mediates its...

Hi, Can anyone tell me at what temperature a 25micron sulphuric acid anodic coating will start to breakdown. I have noticed that after exposure to 135°C the electrical properties of the coating have dropped drastically. Regards Dan

I was just wondering if anyone would be able to tell me why acetic acid is reacted with salicylic acid to form aspirin. I am aware that the latter is toxic and that the addition of acetic acid lessens its effects, but what specific properties does acetic acid have that enable it to do so. I have...

I have a cordless electric lawnmower that runs on sealed lead acid batteries. It is on it's second battery, which has noticeable degraded performance and will need replacing soon. My question is why the original battery, which was rated at 17 Amp-hours, lasted twice as long as this second...

What is the maximum concentration, Moles/liter, possible for one liter of H2CO3 at STP. And how is that calculated ?

i'm trying to dissolve an unknown acid salt and it is not soluble in water at stp. it does dissolve, however, when it undergoes heat and some stirring. is this property representative of most weak acids, that they are not easily miscible in water?

Sorry about the intrusion as I really don't belong here as I have absolutely no background in physics but I have a couple of questions regarding lead acid batteries that I have been unable to find answers to on the internet. First question - why does a battery spark/arc when the negative is...

Homework Statement The background: We performed an experiment testing the fatty acid binding difference of caproic (hexanoic) acid and lauric (dodecanoic) acid to bovine serum albumin. The experiment was performed using a fluorescent marking called ANS(which fluoresces when bound to bovine...

Hi, I came across a problem, which I might have solved a few years ago when I had studied Chemistry, but now I am totally stumped. Would appreciate some quick solutions. I have 25 ml of 0.1 M NaOH, and a volume of 0.1 M of Ethanoic Acid. What volume of ethanoic acid would neutralize the 25...

Homework Statement In order to achieve a high result in this chemistry assignment, I need to have demonstrated a knowledge of challenging content not discussed in class. Every other part of this assignment I've covered (Intro, method, discussion etc), I am just stuck with the calculations...

Hi Everyone, I was just wondering if you know of any factors that would affect the dissociation of a strong acid. I know that weak acids are affected by factors such as the common ion effect and temperature, but would this apply to strong acids as well? I only ask because we added...

Hi, Homework Statement It is in my chemistry lab course. I had 0.1g of an unknown solid that I diluted in 100ml of distilled water. Then, I took 25ml and titrated it with NaOH (Concentration = 0.0189M). To reach equivalent point (the point where concentration of NaOH is equal to the...

1. This problem has been slowly eating me for the past 2 hours. I've done everything I can but I can't seem to answer it. The pH at the equivalence point in the titration of 100 mL of a 0.1M monoprotic acid solution with a 0.1M strong base solution is 8.12 at 25 degrees C. What is the Ka of the...

It is easy to produce hydochloric acid from hydrogen chloride by simply dissolving it into water or even with room humidity, it is sufficiently to form dense white fumes of hydrochloric acid. But is it possible to produce or extract hydrogen chloride from hydrochloric acid? (At best, a cheap...

Hello. I am in need of some assistance in regards to what types of materials I should (and should not) use to contain the various corrosive substances listed in the title. As for the sodium hydroxide, it will be dissolved in water, almost to the point of saturation. I have never dealt with...

Find the molecular, total ionic, and net ionic equation for the aqueous reaction between strontium nitrate and sulfuric acid. I did like this, please check this out... Sr(NO3)2 + H2SO4 -> 2HNO3 + SrSO4 is molecular equation. Sr+2(aq) + 2NO3-1(aq) + H+1(aq) + HSO4-1(aq) -> 2H+1(aq) +...

Homework Statement The molecular weight of a monoprotic acid HX was to be determined. A sample of 15.126 grams of HX was dissolved in distilled water and the volume were brought to exactly 250mL in a volumetric flask. Several 50mL portions of this solution were titrated against NaOH solution...

hello everyone, i read it somewhere:-- In such a solution at 25C, the product of concentration of H+ ions with the concentration of OH- ions must be 10^-14. In an acid solution, by forcing a high concentration of H+ ions, you necessarily suppress the concentration of OH- ions. what is...

1. Determine the volume of 1.50 mol dm–3 of hydrochloric acid that would react with exactly 1.25 g of calcium carbonate. 2. 2HCl(aq) + CaCO3(s) --> CaCl2(aq) + CO2(g) + H2O(1) 3. I tried to do this: (1.25 g CaCO3) / (100 g CaCO3) = 0.0125 moles of CaCO3 2 moles of HCl are needed...

I'm preparing for a chemistry lab relating to "Determination of the dissociation constant of a eak acid". In part of the lab, I will b doing the following for measuring "Ka" for ethanoic acid using the indicator method: 1- Mix ethanoic acid (0.02M, 5cm3) and sodium ethanoate (0.02M, 5cm3)...

Just a question that is been nagging me for a long time... if a person were to put 18 mol/L HCL(aq) on your skin what kind of damage would there be? weither it be short term effects, long term effects, or just general damage? Replys are welcome :P

Homework Statement Sulfuric acid (H2SO4) were collected from the waste acid container and the volume is 350 l. Homework Equations a) Calculate the acid pH of the solution when the hydrogen ion concentration is 2.0 ∙ 10-4 mol / l. The Attempt at a Solution i think it's simple no ...

Homework Statement (c) A 0.1036 g sample of copper metal is dissolved in 48 mL of concentrated HNO3 to form Cu2+ ions and then water is added to make a total volume of 208.1 mL. (Calculate the molarity of Cu2+.) Homework Equations Molarity = Moles/Liter The Attempt at a Solution...

Homework Statement Base metal zinc (Zn) reacts with concentrated hydrochloric acid (HCl) forming gaseous hydrogen and zinc chloride. STP conditions: pressure p = 101,3 kPa , temperature t = 0C. The equation of state for ideal gas: pV = nRT R = 8,314 J /(mol K) Homework Equations Write...

Homework Statement After titrating 25mL 0.1M acetic acid with NaOH, determine the molarity of the NaOH. Equivalence point: 23.99mL NaOH added, pH = 8.37 Initial point: 0mL of NaOH added, pH = 3.07. Homework Equations ka = kw/kb kb = [CH3COOH][OH]/[CH3COO] The Attempt at...

Hello PF, I am trying to chemically strip a metal oxide film from fused silica. The film was deposited at a fairly high temperature, which makes it more difficult to strip than at lower temperatures. During deposition, the film makes its way into the pores of the substrate and slow cooling...

Homework Statement Assuming stomach acid is 0.1 M HCl(aq), what volume of stomach acid can be neutralized by one antacid tablet? We have the titration curve we got with .5M HCl titrating a tablet dissolved in 100ml distilled water Homework Equations ? The Attempt at a Solution ?

What does that mean. Transfer of 1-carbon unit. What is a 1-carbon unit, are they referring to carbon number 1(according to nomenclature) of the molecule being transferred or a single carbon atom from the molecule is transferred? Can anyone explain. Thanks :smile:

Homework Statement If .0200L of .100M nitrous acid is titrated using .200M NaOH solution, what will the pH be at equivalence? Homework Equations The Attempt at a Solution I figured out that the volume of NaOH at equivalence is .01L, however I do not know what to do after that...

Homework Statement Grapefruit juice contains approximately 0.75g/oz of citric acid (H3C6H5O7(aq)), a triprotic acid. If one tablet of Tums contains 500mg of CaCO3, would one tablet be able to neutralize the acid in one glass of grapefruit juice (8.0oz)? Show your calculations. Therefore I...

Homework Statement Why is it possible to use dimethyl ether as a solvent for extraction of benzoic acid and not dioxane? Homework Equations The Attempt at a Solution I'm thinking that it's because dioxane has more of a hydrophobic character since it has many carbons, but then...

Hi I am looking for the solubility of acetyl salicyclic acid in ethyl acetate vs. temperature. So far I have only been able to find its solubility at 25 degrees C (0.453 M). However, I would like to know its solubility at higher temperatures (77 degrees C, to be precise). If anyone knows...

What is the mechanism that results in formic acid quickly converting to CO2. I know this happens under basic conditions so I'm assuming the first step is forming the formate ion.

I want to measure the pH of sweat in order to estimate the anaerobic threshold by detection of lactic acid. Many references point out that it's lactate, not lactic acid, that is found in sweat. However, according to this article...

which acid is more strong HNO3 or HBr? i get the the pH for HNO3 is 5 and for HBr is 2 is it Possible if HNO3 is more strong acid so it must have the low pH than HBr yes? thanks

I need some help with developing an idea for my design lab. it is a lab where we must come up iwth a problem to solve on our own. This time we are to discover something new about acids and bases. What would be a good problem? thank you!

i need to mark all the Base and Acid in the Equation (in the picture) and tell why i think i choose Them to be acid and base i mark the Acid in red line and the Base in blue line, tell me if i Right. my Explanation is HNO is Acid and it give proton While CH3NH2 is base and it gain in the...