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Answer to Question #24040 in Other Chemistry for arcdp

Question #24040
1) 4g of NaOH is mixed with 1.5L of a solution which has a pH of 1.54, what is the new pH?
2) A solution of 4ml of LiOH of 0.5M and 15ml of 0.1M of H are mixed, what is the new pH?
Pls. answer in complete, your answer is very helpful to me tnx...
Expert's answer
1)
A pH of 1.54 means [H+] is 10-1.54 or 0.029 M

4 g of NaOH in 1.5 L of water is a concentration of 0.067 M

The OH- and H+ will react, leaving 0.038 M OH-

Using Kw, that gives 2.6 x 10-13 for the concentration of H+, which is a pH 12.6

2)
4 mL of 0.5 M OH- contains 2 mmol of OH-

10 mL of 0.1 M H+ contains 1 mmol of H+

After they react, you'll have 1 mmol of OH- left in a total of 19 mL, or a 0.053 M solution

That means 1.9 x 10-13 M H+, or a pH of 12.7

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