Acid Definition and 698 Threads

1) In an experiment to determine the molecular weight and the ionization constant for ascorbic acid (vitamin C), a student dissolved 1.3717 grams of the acid in water to make 50.00 milliliters of solution. The entire solution was titrated with a 0.2211-molar NaOH solution. The pH was monitored...

Peptide nucleic acid has been hypothesised as the primordial genetic material: Nelson, KE, M Levy, and SL Miller. 2000. Proc Natl Acad Sci 97(8):3868-3871. Peptide Nucleic Acids rather than RNA may have been the First Genetic Material. Nielson, PE. 1993. Orig Life Evol Biosph...

Hey can anyone help me with this question? What is the major product from the acid-catalyzed hydration of 3-methyl-2-pentene? a. 3-methylpentane b. 3-methyl-1-pentanol c. 3-methyl-2-pentanol d. 3-methyl-3-pentanol e. 3-methoxypentane Would the answer by D? My reasoning is that when...

Hi. I am having trouble with acid-base titration excercises. 0.02 L butanoic acid @ 0.1 M is titrated with 0.01 L NaOH solution @ 0.1 M. The Ka of butanoic acid is 1.54X10^-5. Find the pH. The answer is 4.81. I know how to find the pH when no NaOH is added, but I really don't see how the...

Hi. Is there any acid that will cut through Aliuminium (1mm thin).

Can anyone tell me how to calculate pH of an strong and weak acid with conc 10^-^7 M . Please just explain the method. i read a little about it. Why is it necessary to take into consideration the change in conc of H^+ from water? -Benzun

can someone help me think of an application of why a persion would need to test for acid and base?

Three fatty acid, when condense with glycerol, they donate or give out their OH- ions and combine with the H+ ions to form water and fat molecule. According to my chemistry teacher, an acid is a covalent molecular compound, which when dissolved in water, forms hydrogen ions H+ (aq). As fatty...

Hi, I got this question for my chemistry class, and I simply don't know where to start. Do I have to find out the volume of HCl first? The label on a bottle of hydrochloric acid says the solution is 3.7% hydrogen chloride. You wish to the determine the actual concentration. You fill a burette...

Hello. I am looking for some results of the experiment. The results should be the loss in weight of the marble chips with the Acid at different strengths ( 2M, 1M, 0.5M, 0.25M and 0.25M). Thanks.

What is going on here? Should I shelter my children from the rain? One of my friends was telling me about acid rain how it used to happen. I said I don't remember it raining acid. ? :cry: The unknown! But seriously, is this a real threat, was it? Was it just a bunch of hype caused by...

I need help: A beaker with 200 of a 0.1M acetic acid buffer with a pH of 5.20 is sitting on a benchtop. A student adds 8.60 of a 0.380 solution to the beaker. How much will the pH change? The of acetic acid is 4.76.

How many moles of H3O+ must be added to one liter of a solution to adjust the pH from 7.17 to 5.85? Correct answer 1.34E-6 (1.34 * 10-6) The correct answer is given, however I would like to know how to do this problem.

hi all, i understand that maleic acid being in cis form is more acidic than fumaric acid. is it due to the fact that because of the cis configuration, it can form intramolecular H bonds which then stablises the monoanion through resonance or? then in the monoanion form, furamate monoanion is...

Hi, I've got this question where I have to describe two methods of measuring the pH of a substance. I've already got the one using electrochemical potentials, but I'm a bit stumped on the second method. What I've said is to carry out a titration with an alkali until the solution is...

Hello, A friend of mine has synthesized a compound with pentafluorophenyl groups, and is willing to characterize it via an additional 19F-NMR. However, the person responsible for recording NMR spectra is inexperienced in 19F-NMR, so we need help on recording the spectra. We have...

Hi Guys! cakculate the pH of a 0.1M acetic acid when it is half neutralized by NaOH solution (Ka= 1.7 x 10^-5) Ans: 4.7695 My dear friends! I am unable to understand the language of this question , Please tell me this question in some easier words so that i can just solve it on. A...

I dissolved some boric acid into some isopropyl alcohol and when I burned the solution the flame was green. I am guessing that I am not getting triisopropyl borate and that the flame just burns green due to the presence of borate ions in solution. Adding sulfuric acid would create the ester...

Which is more soluble in hexane, hexyl ethanoate or octanoic acid? I'm thinking it's octanoic acid with the longer uninterrupted hydrocarbon chain, where as the ester's longest uninterrupted hydrocarbon chain is composed of six carbons. Is this correct? If not can you please explain why? Thanks.

I have two organic compounds, Methanol and Methanamine (CH3OH and CH3NH2). The question is to predict their relative acidity. I reasoned in this way. Oxygen is more electronegative than hydrogen. So methanol will bond the hydrogen more tightly since bond strength is directly proportional to the...

Is 1-fluoroethanol significantly more acidic than regular ethanol? (Not just "slightly" more acidic) What about 1-chloroethanol? Is it significantly more acidic than regular ethanol? (see the attached image for structures of these molecules)

What is the chemical formula for oleic acid?

Does zinc react with both acetic acid (CH3COOH) and phosphoric acid (H3PO4)? I can't figure out the chemical equations for them and am wondering if no reactions occur. Thanks.

For cyclohexene and sulfuric acid reaction, is a precipitate suppose to form? the results looked yellow-orange ish, but it became murky. I'm suppose to note the solubility change, but i don't know what to say for it. Please help thanks. For Toluene though, i heated it as well, and there was...

I know that hydrochloric acid reacts with a heated mixture of iron and sulfur, but why does it not react with an unheated mixture of iron and sulfur? (During a demonstration, I could see a soggy mixture of the powder and fillings in the acid, and I noticed nothing so I am assuming no reaction...

Can mixing (in series) old cells with new cells of the same voltage and rating damage the new cell? If so why? The cells are recharable.

i need some helps...how does acid affect the ionization of water ? ...how does acid affect the ionization of water ? if there are more hydroximum ions in the solution,what will the change of ionization of water?

Why is it better to use phenolphthalein than bromothymol blue to determine the equivalence point which is equal to 7? bromothymol blue: 6.0 - 7.6 yellow @ blue phenolphthalein: 8.3 - 10.0 colorless @ pink

is the addition of bromine to trans-cinnamic acid syn or anti addition??

Can anyone here explain to me the role of auxin in cell's elongation? :confused: I think it's related to the acid growth hypothesis,but i need the explanation on how this hypothesis works. :rolleyes: thanks a lot for anyone who help :smile: o:)

Hello This is quite a simple question, but I am hoping someone has the time to help me with this. So, I have a question relating to lactic acid. Lactic acid (C3H6O3) -or 2-hydroxypropanoic acid- obviously has both a carboxyl group and a hydroxyl group. Now here's my question, should...

So this is probably going to look like a ridiculously easy question, but I'm stumped. I have searched for hours looking for a formula to use, and I've given up on my text. Question: A 0.1 mol/L aqueous solution of weak monoprotic acid has a hydrogen ion concentration of 0.001 mol/L. The...

a compressed spring is completely dissolved in acid what will happen to the elastic potential energy of the spring? With reasons. I think that the E.P.E will have an effect on the heat released but I still don't have backup. I am still not so advanced.

hi, iam doing a investigation in my chemistry class. this investigation is totally independent & there is very little help available frm the teachers. so for the investigation they have given some suitable topics on which i can do my practical & other stuff. the topic i choosed is CITRIC ACID...

I've posted this question in another thread... didn't get the answer though Why does a strong acid (or a base) ionizes to a higher extent? Is this extent of ionization the only criteria for characterizing an acid (or a base) as strong or weak. Is it the simple bond polarization phenomenon...

Can you burn gasoline to form nox witch can then be condensed with the other impurities to make dilute nitric acid witch could then be purified to make 63% nitric acid (by way of heating till smelling nitric vapors) it would make since that nox could be produced by burning gasoline because it...

I was recently reading about the method by which sulfuric acid was produced in the old days. Apparently, copper sulfate pentahydrate (green vitriol), when heated up, breaks down into copper dioxide, water, and sulfur trioxide. The sulfur trioxide and water then bond to form sulfuric acid...

If i have a reaction between iron(II) sulphate, sulphuric acid and potassium permanganate (KMnO4), what are the ions present in the salt??! similarly, if i have a reaction between nitric acid and copper solid, what are the ions present in salt? can nebody help me? thanks :)

Which of the following would be the strongest evidence in support of a scientist's contention that a local area was experiencing acid deposition? 1. An increase in the rate of photosynthesis of aquatic plants in a local lake 2. A sudden die-off of all the fish in a local stream 3. A gradual...

if we treat acetaldehyde with dilute base which out of the following two will be the major product: a}acetic acid b}alpha hydroxy butanal Ofcourse anyone would think of an aldol product which would be [B]beta hydroxy butanal[/B],but that is not given here,isn't there a slight chance that...

There are many different types of kidney stones, but the most common is calcium oxalate, CaC2O4. The pH range of blood is 7.2-7.3. The pH of urine ranges from 4 to 8. Draw the Lewis structure of oxalic acid (H2C2O4) and the oxalate anion (C2O4-2). H2C2O4 Ka1 = 5.6×10-2, Ka2=5.42×10-5...

Hey Guys, Sorry once again i am posting a thread of a boring topic, but seriously i couldn't find any information on the search engines that why i need your help on, the advantages and disdavantages of Citric acid in lemon juice. I found couple of sentences, but i don't know what it means...

Hey there ppl! I am doing an Acid/Base Titration to investigate whether the concentration of citric acid lemon juice, change over a period of 5 days. So i kindda need some help in this experiment, cause we are not allowed to ask our teacher any help! The main purpose of this experiment is that...

I don't undestand this question. How can i determine which will be the major component? HCl + Na2CO3 - > NaCl + H2O + CO2 Is it water?

Hi Does anyone know the reaction of an organic acid (carboxylic acid) with aluminium phosphate (AlPO_4)? If yes, please do let me know. Thanks and cheers Vivek

My friend and I are stuck on a lab-work, where we are to find the enthalpy of combustion for stearic acid. Does anyone know the reaction formula for the combustion of stearic acid?

Hi, I want to know what happens when a mixture containing aldehyde(s) and ketone(s) is introduced to a mixture of formamide HCONH_2 and formic acid HCOOH. Do both aldehyde and ketone react? Or does only one react? Eagerly awaiting a response... Thanks and Cheers Vivek

How does the absense of catalase cause lactic acid fermentation by bacteria? Also, what coenzymes/cytochromes do lactic acid-producing bacteria not have that may cause them to anaerobic?

The book that I have goes into very little detail about how to do these sort of problems. I know that you have to balance the equation at the end, which I can do. I do not know how to find the elements! :cry: (Besides the fact that Sodium Hydroxide is NaOH.) Can anyone help? THNX! :biggrin...

I see a lot of poisons that say do not induce vomiting. One such thing is phorsphoric acid. Why not vomit? Wouldn't that immediately get the poison out of your system?