31 Answered Questions for the topic PH

02/14/21

Calculate the pH and concentrations of CH3NH2 and CH3NH+3 in a 0.0459 M methylamine (CH3NH2) solution.

Calculate the pH and concentrations of CH3NH2 and CH3NH+3 in a 0.0459 M methylamine (CH3NH2) solution. The Kb of CH3NH2 is 4.47×10^−4.

Finding pH from new solution

1.00L buffer made with 1.02 M generic acid HA and its conjugate salt 0.9 M NaA has a pKa of 4.87. If you add 51.0 mL (0.051 L) of 0.456 M HNO3, what is the new pH?

Using A Natural pH Indicator to Measure Household Chemicals?

Some household chemicals, such as hydrogen peroxide and chlorine bleach, break down many organic molecules. Do you think it would be wise to try to measure the pH of these types of solutions using... more

12/09/19

Calculating The pH of Solutions

Calculate the pH of each of the following solutions, and label each as acidic, basic, or neutral. Solution1.) [H3O+] = 1.0 × 10-9 M2.) [H3O+] = 0.001 M3.) [H3O+] = 3.7 × 10-6 M

07/10/19

How is the pKa of extremely weak acids determined?

According to Wikipedia, the conjugate acid of LDA has a pKa of about 35 - which is in line with figures I've seen elsewhere. How then can such a weak acid's pKa be determined? If the determination... more

Why does depurination happen at a higher pH (or under less harsh conditions) than depyrimidation?

I've always wondered why the N-glycosidic bond, which connects the adenine or guanine purine bases to their sugars, was the easiest to cleave via acid hydrolysis, or why purines have the lowest... more
Ph

11/12/18

Finding PH of carboxylic acids

HCOOH(l) = HCOO–(aq) + H+(aq) Ka= 10^–4What is the pH of a 10^–2M HCOOH solution?

10/07/18

Buffers on a System

What are the effects on pH by addinga. 0.0060 mol of HCl b. 0.0060 mol of NaOH to 0.300L of a buffer system that is 0.250M acetic acid and 0.560M sodium acetate? First find the pH of the buffer... more

Effective buffer range?

The Ka for a hypothetical weak acid HX is 3.1 x 10-5. Buffer solutions containing HX and NaX could be prepared to make a range of pH values. What would be the lower and upper pH values of the... more

07/06/18

Calculate pH after adding 0.2mL of 1M HCl to 10mL of 1.0x10^-4M HCl

pH?  

Why is the pH of the first equivalence point, of a titration of polyprotic acid, not equal to7?

A titration of phosphoric acid with sodium hydroxide. The first equivalence point has a pH of about 5.    My thoughts are that because it is only the first equivalence point, only one H+ has been... more

Calculate the Ka of a weak acid?

A sample of a certain monoprotic weak acid was dissolved in water and titrated with 16.00mL of 0.125M NaOH to reach the equivalence point. During the titration, the pH after adding 2.00mL of NaOH... more

06/19/18

Calculate pH

[NH4Br](aq) = 0.020M , pKa of NH4+= 9.24   Given that the question is asking for pH, I know I need to find the [H3O+], so I've set up the reaction to look like this: NH4Br (aq) + H2O ⇌ H3O+ +... more

How many milliliters of concentrated HCl 12.1 M should be diluted to prepare 200.0 ml of an acid solution with a pH of 1.50?

 This was an example for a exam review, not sure how to solve. A list of steps would be greatly appreciated, so I actually know how to solve it myself and can apply it to other examples like this.

If I take 25 ml of milk of magnesia (80 mg/ml of Mg(OH)2) and to this I slowly add 25 ml of 0.1 N HCl what will be the final pH?

Milk of Magnesia has a documented pH of about 10.5 and indeed this is the pH I achieved experimentally when measuring with a pH meter. I have an excess of base 0.0171 moles vs 0.0025 moles of acid.... more

01/08/18

If I dissolve a Rolaids tablet (550 mg CaCO3 and 110 mg Mg(OH)2) in 25 ml of water and then add 25 ml of 0.1M HCl, what will be the final pH?

Am doing an experiment on antacids and need to know pH of Rolaids tablet in water, followed by pH of mixture after HCl is added. 

01/08/18

If I dissolve a Tums tablet(1000 mg of CaCO3) in 25 ml of water and then add 25 ml of a 0.1N HCl, what Is the pH of the mixture?

I know that CaCO3 isn’t very soluble in water. I crushed the tablet and added water to create a suspension. I then measured the pH and found it to be on average about 9. If I then add 25 ml of 0.1... more

A typical pH value for rain or snow in the northeastern United States is about 4.0.

s this basic or acidic? What is the corresponding hydrogen concentration? How does this compare with the hydrogen concentration of pure water?Round your answers to two decimal places when... more

How many mL of concentrated H2SO4 are needed to decrease the pH to 1.5 of 10 mL of a 0.1 M NaOH solution?

How many mL of concentrated H2SO4 are needed to decrease the pH to 1.5 of 10 mL of a 0.1 M NaOH solution?   Thanks
Ph

04/14/17

The statement "Frank isn't a study animal, but Pete is" correctly symbolized as

A. P v Q B. ~(p&q) C. P & Q D. ~p & q

03/07/17

Calculate the pH of a buffer solution obtained by dissolving 0m1 moles of pyridine and 0.2 moles of pyridinium chloride

I need help with my chem quiz and I do not understand how to approach a question like this. Please help.

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