Acid Definition and 698 Threads

I wonder if someone can help me here. For part of my geography dissertation I'm hoping to completely dissolve some very pure limestone (~99% CaCO3) to get some microfossils out. I'll be using either acetic, monochloric or formic acid (probably dilute) because as far as I'm aware these are the...

I have figured this out

Question: Calculate the change in pH of a 0.400 M C6H5COOH solution when 100.0 ml of a 2.50 M KOH solution is added to 1.000 L of C6H5COOH. For C6H5COOH, Ka = 6.46 X 10^-5. Work Done So Far: We're to determine the change in pH, thus we'll need to find the original pH. Ka = 6.46 X...

If one would make no assumtions to try to simplify, except for just assuming OH- were negligible in a solution of weak diprotic acid, H2A, we can create four equations to represent concentrations for : H2A == H + HA- HA- == H + A- Each of those has a K value for equilibrium constant...

Hello, i would really appreciate it if someone could help me with this problem. I would like to know the pH of citric acid at various concentrations. 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 15%, 20%. From what i have read it has something to do with its pKa value which for citric acid is...

Hi. Can oxalic acid be used as a primary standard to standardise a basic solution, such as sodium hydroxide? I can't think of any reason why it couldn't be used, but i could very much be missing something.

Nitric acid equation! Homework Statement we're doing reaction predictions and were given nitric acid to balance. Homework Equations Nitric acid yields nitrate+water NO3 --> NO2 + H2O but I've been up to a 36 for a constant and still can't get it..PLEASE HELP!:bugeye: The...

Homework Statement Given H2SO4 + 2LiOH --> Li2SO4 + 2H2O, how many mL of a 0.700-M solution of KOH are needed to react with 235 mL of a 0.350-M H2SO4 solution? The Attempt at a Solution Really, I have none. My problem is that I don't understand what the question is asking. I could...

Hi everybody I know that concentrated sulfuric acid doesn't react gold. But I am puzzled because the oxidation potential of sulfure in concentrated H2SO4 is even higher than that of gold. Could anyone help me please. Thanks

Question: TRIS is a weak base. Compute pH of a solution containing .050 moles of TRIS and .020 moles of HCl in a total volume of 2L. pKb for TRIS is 5.92. Use RNH2 to represent TRIS. Equation: pH = pKa+ log ([conjugate base]/[acid]) Work: change equation for pOH: pH = 14-pOH pOH =...

Homework Statement I'm making a table on excel with the calculated pH of the solution vs the actual measured pH from the lab. My problem is finding the pH of a acetic acid-acetate buffer that has been titrated with HCl, once the moles of HCl are greater than the initial quantity of mols of...

Homework Statement Sketch curve of pH vs volume of base added for the titration of 50.0ml of 1.00M acetic acid with 1.00M sodium hydroxide. Homework Equations none, i think. The Attempt at a Solution Okay, first off, this is a weak acid, the first point on the curve would be the initial...

Homework Statement You dissolve an unknown quantity of weak acid HA into 50 mL of water. It only takes 1 mL of 5 M NaOH to completely neutralize the acid. The Ka of the acid is 3.2 x10^-4. What is the pH at the endpoint?Homework Equations Ka * Kb = Kw pH + pOH = 14 p(of whatever) = -log(of...

chem question please help Homework Statement Ok, so there's .9734 g sample which contained monoprotic benzoic acid C6H5COOH and it's dissolved in 75 mL of water and titrated to the equivalence point with 31.78 mL of .09251 M NaOH solution. a) how many moles of benzoic acid were titrated b)...

Sulphate ions and nitric acid wouldn’t react? Is it because sulfuric acid is a very strong acid, while nitric acids are very weak. So the conjugate base of sulfuric acid which is sulphate ions is very weak and too weak to accept the proton from a weak acid like nitric acid. When you have a weak...

Concentrated sulfuric acid (18.4 molar) has a density of 11.84 g per ml dilution with water to 5.20 molar, density of 1.38 g per ml can be used as an a electroyte is lead batterys. What is the molality of the 5.20 molar H2SO4 solution? well I am not exactly sure where to start, but i...

Why isn't ammonia and hyronium considered triprotic acids? Both nitrogen and oxygen are highly electronegative so other negative charges would like to snactch their hydrogens. Is it because it would take too much energy due to its tetrahedral geometry which allows their charges to be distributed...

Homework Statement A vessel contains 500mL of .1 molar H2S solution. For H2S Ka1 = 1 x 10^-7 Ka2 = 1.3 x 10^-13. What will the pH be when 800mL of .1molar NaOH has been added. Homework Equations ph = -log([H]) ph = pka + log(B/A)The Attempt at a Solution This is how I started, I found the...

A 0.1 mol/L aqueous solution of weak monoprotic acid (contains one ionizable hydrogen atom) has a hydrogen ion concentration of 0.001mol/L. The value of Ka is: a) 10-6 b) 10-2 c) 10-3 d) 10-5 I took 0.001 and divided by 0.1 to get 10-2 and I also multiplied them together to get 10-5...

An Arrhenius acid a) in an ionic compound that contains hydrogen atoms b) produces an aqueous solution whose pH is greater than 7 c) releases hydrogen ions in aqueous solution d) is always a neutral molecule I know that c) is true and d) is false. However, I don't know if a) and b)...

A silver wire is added to nitric acid. I got 2Ag + 2HNO3 -> H2 + 2AgNO3. It's not right though, can anyone help me?

Hi, I have two questions that I am stuck on involving stearic acid solutions. 1a) 0.01mL of a solution containing 2 grams per litre of stearic acid in acetone is used. What mass of stearic acid is present in this drop of solution? Solution: 0.01ML solution X (1L/1000mL...

Hello, I am writing my extended essay (in the International Baccalaureate) in chemistry, yet I have come across a major problem! I calculated the activation energy for the reaction: 2C6H8O6 + 02 <=> 2C6H6O6 + 2H20 I have found Ea to be 2 kJmol^-1, which is a very small value! I desperately...

At the school where I teach, we recently had a recycling bin door blow off due to an explosion in a water bottle. Lots of heat was generated as evidenced by the melted, hard plastic and there was a sweet acidic smell to the liquid coating the inside of the bottle. The liquid had a pH of about...

I'm looking for an acid or whatever that will react with plaster of paris that has already set to a solid to dissolve it back into a liquid state. Basically, I want to cast something in a plaster of paris mold, but instead of breaking the plaster mold off I'll "melt" it off. I need to do it in...

Hi can someone help me out a little bit on this question How might acid precipitation threaten the fitness of the environment? I need to include molecular aspects such as pH.

I tried looking for this online, but didn't really find anything can someone help me out I need an example of a naturally- occurring acid-base buffering system in an organism

I want to learn the GFD lead acid batteries used in NPP. Have Exide and Deka ever supplied for NPP, or who are the main suppliers in this field? We know VRLA betteried dominate the market now, but have this type ever been use in NPP? As for UPS, do bettery suppliers provide UPS together...

It requires 46.5 mL of 0.215M NaOH to neutralize 15.0 mL of aqueous H2SO4. What was the molarity (M) of the acid sample? I'm not quite sure how to approach this quesiton, if anyone has and starter tips please let me know.

So last night, not really thinking about it, I mixed about 2/5L of Rum and about 3/5L of Fruit Punch together, they've been in the fridge since then. I smelled and tasted it, and it still seems alcoholic, so I'm guessing that either esterification is happening real slow, or its already happened...

1)Which of the following is not both a Bronsted-Lowry acid and a Bronsted-Lowry base? a. OH- b. HSO4- c. SH- d. HCO3- e. H2PO4- I knwo its not HCO3, H2PO4- AND HSO4-, but i cannot figure out whether OH can act as an acid and base or not, i know its produced when a base react...

I have a question concering acid base reactions. All strong acid-strong base reactions produce a water soluble salt and water with the exception of what? I need to know that along with the formula unit, total ionic and net ionic equation. Please any help would be appreciated. Thank you

Hello everybody I have tried to obtain but I have not been successful the dielectric strength or breakdown voltage values of following materials... these are: FORMIC ACID and GLYCERIN. (to room temperature) I need to know these values... thank you again. Norbert

Carboxyl acid strength and electronegativity... How do they relate?? Here is a question that I had on a recent chem II exam. Which is the strongest acid? A. CH3COOH B. CF3COOH C. CCl3COOH (Cl for chlorine, not Carbon 13) D. CBr3COOH E. CI3COOH I selected choice A because the...

When a metal displaces hydrogen from a non-oxidizing strong acid, which substance is the oxidizing agent? Thanks :smile:

I want to ask that there is any situation that the solution of Hydroclauric acid and water can make the pH of this solution gretater than 7.

i hv some problems , could anybody suggest me . does alkalinity ( as OH- ) and free acid value ( as CH3OOH ) can we convert any of them to be the same unit ? as i want to compare it is the same value or not but one it's show in OH and another one show it CH3OOH. or we could not compare as it's...

How to convert boric acid to boric oxide? To a few crystals of boric acid in a test-tube add a little methanol and some concentrated sulphuric acid. Heat and ignite the vapour evolved. Why should barium and copper interfere in this test?

You have just built a swimming pool that has the dimensions of 7.5m in length and is 5 metres in width. When filled with water the depth of the pool os exactly 1.5metres. The lable on the 5 litre pool acid bottle indicates that this has a conc of 33.0g/100ml of HCl. Makin the assumption that...

acetic acid Figured it out thanks

What materials for positive pole, negative pole and what acid when put together create a perfect battery? (I'm not talking about everyday purpose for a batery (so never-mind how bio-hazardous a material is), but a theoretical (greatest voltage, greatest current possible, yet stable enough (so...

Hi, I have searched rigorously for a solution to this problem but I seem to get inconclusive answers. I want to find the percentage purity of iron in cast iron and the best way to go about this is a redox titration. The first step is to reduce the Iron to Fe2+ . I intend to do this by...

My schoolbook states: My question is: What are the reactions that occur in the leaves that cause their danification? I googlelize and found: It also attacks trees more directly by eating holes in the waxy coating of leaves and needles, causing brown dead spots. That's ok, but how...

The acid dissociation constant as an equilibrium constant is affected by temperature. Right? Thus, could someone tell me if the reaction between a general acid and water: HA(aq) + H2O(l) ⇌ A-(aq) + H3O+(aq) is exothermic or endothermic? I think it is endothermic by similiarity with water...

I have a question here and i don't really know how to do it. I need to know : What is the pH of a mixture of 30ml 0.1M acetic acid and 30ml of 0.1M NaOH? \[HC_2 H_3 O_3 = 1.8*10^{ - 5} \] I'm not even sure what the equilibrium equation would be! Any help would be appreciated.

Does anyone happen to have the rate law for potassium permanganate reacting with oxalic acid ? I tried searching google with no avail :frown:

Which acid of the following set has the strongest conjugate base? a. CH4 b. NH3 c. H2O d. HF Is this correct? Any help is appreciated

Hydrocyanic acid is a weak acid (Ka = 4.9 x 10-10). If 0.1300 moles of gaseous HCN are dissolved in 0.8700 liters of water. Determine the pH of the HCN solution formed. HCN + H2O <-> H3O+ + CN- K_a = [CN-][H3O+]/[HCN] M HCN = 0.1300 mol HCN/0.87351338 L = 0.14882428 M HCN ?? For L...

1. What is the hydronium ion concentration and the pH for an aqueous solution of NH3 that has a hydroxide ion concentration of 2.25E-3 M? a. 4.44 x 10-11 M, 3.65 b. 4.44 x 10-11 M, 10.35 c. 4.44 x 10-12 M, 2.65 d. 4.44 x 10-12 M, 11.35 [OH] = 2.25E-3 pOH = -log(2.25E-3) = 2.6478...

1. Which Bronsted-Lowry acid has the strongest conjugate base? a. HBr b. HClO4 c. HF d. HI 2. What is the strongest acid among the following? a. HF b. HCl c. HBr d. HI Correct? Thanks.