Question

Find the pH of each of the following solutions of mixtures of acids. 8.0×10−2 M in...

Find the pH of each of the following solutions of mixtures of acids.

8.0×10−2 M in HNO3 and 0.170 M in HC7H5O2

1.5×10−2 M in HBr and 2.0×10−2 M in HClO4

9.5×10−2 M in HF and 0.230 M in HC6H5O

0.100 M in formic acid and 4.5×10−2 M in hypochlorous acid

Homework Answers

Answer #1

Find the pH of each of the following solutions of mixtures of acids.

8.0×10−2 M in HNO3 and 0.170 M in HC7H5O2

This is the mixture of strong acid and weak acid.

HC7H5O2 (benzoic acid) is a weak acid; Ka = 6.3x10^-5
HNO3 (nitric acid) is a stong acid

By itself, 8.0x10^-2 M HNO3 would have a [H+] = 8.0x10^-2

Let HA represent benzoic acid and X= the H+ contribution from benzoic acid
A^-1 will also = X

Ka = [H+][A-]/ [HA-X]

This H+ from benzoic acid is very small. Thus the pH of this mixture is depending on only strong acidHNO3:

Here;

8.0×10−2 M in HNO3 or H+=8.0×10−2 M

pH = -log(8.0×10−2 )

= 1.10

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Find the pH of each of the following solutions of mixtures of acids. Part A 7.0×10−2...
Find the pH of each of the following solutions of mixtures of acids. Part A 7.0×10−2 M in HNO3 and 0.185 M in HC7H5O2 Part B 1.5×10−2 M in HBr and 2.0×10−2 M in HClO4 Part C 8.5×10−2 M in HF and 0.230 M in HC6H5O Part D 0.110 M in formic acid and 4.5×10−2 M in hypochlorous acid
Find the pH of each of the following solutions of mixtures of acids. 9.5×10−2 M in...
Find the pH of each of the following solutions of mixtures of acids. 9.5×10−2 M in HF and 0.230 M in HC6H5O
Find the pH of each of the following solutions of mixtures of acids. Part A 0.130...
Find the pH of each of the following solutions of mixtures of acids. Part A 0.130 M in HBr and 0.115 M in HCHO2 Part B 0.170 M in HNO2 and 8.0×10−2 M in HNO3 Part C 0.190 M in HCHO2 and 0.23 M in HC2H3O2 Part D 4.0×10−2 M in acetic acid and 4.0×10−2 M in hydrocyanic acid
Find the pH of each of the following solutions of mixtures of acids. 4.5×10−2 M in...
Find the pH of each of the following solutions of mixtures of acids. 4.5×10−2 M in acetic acid and 4.5×10−2 M in hydrocyanic acid
Please answer all parts as I am limited on questions. Thanks in advance. Find the pH...
Please answer all parts as I am limited on questions. Thanks in advance. Find the pH of each mixture of acids given the table of Ka values. TABLE:: Acid Ka benzoic acid 6.5×10−5 formic acid 1.8×10−4 hydrobromic acid >1 hydrofluoric acid 6.8×10−4 hypochlorous acid 2.9×10−8 nitric acid >1 perchloric acid >1 phenol 1.3×10−10 Questions: A: 8.0×10−2 M in HNO3 and 0.185 M in HC7H5O2 Express your answer to two decimal places. B: 1.5×10−2 M in HBr  and 1.0×10−2 M  in HClO4 Express...
Find the pH of each of the following solutions of mixtures of acids. 0.100M in HBr...
Find the pH of each of the following solutions of mixtures of acids. 0.100M in HBr and 0.115M in HCHO2
1.)Calculate the pH of each of the following strong acid solutions: 7.5×10−3 M HBr 1.28 g...
1.)Calculate the pH of each of the following strong acid solutions: 7.5×10−3 M HBr 1.28 g of HNO3 in 570 mL of solution 4.40 mL of 0.290 M HClO4 diluted to 50.0 mL A solution formed by mixing 14.0 mL of 0.100 M HBr with 21.0 mL of 0.220 M HCl
Find the pH of each of the following solutions of mixtures of acids.    a. 0.180M...
Find the pH of each of the following solutions of mixtures of acids.    a. 0.180M in HCHO2 and 0.22M in HC2H3O2 b. 6.0
Find the pH for the following solutions: a) A solution that is 0.115 M in HBr...
Find the pH for the following solutions: a) A solution that is 0.115 M in HBr and 0.130 M in HCHO2 b) A 0.25 M CH3NH3I solution? (Kb = 4.4 x 10-4 M for CH3NH2) c) A 0.0180 M solution of HClO2? (Ka = 1.1 x 10-2 M) d) A 0.0180 M solution of Sr(OH)2 e) A 0.170 M solution of KOCl? (For HOCl, Ka = 3.5 x 10-8 M) f) A solution that is 3.00×10−2M in HI and 9.00×10−3M...
Find pH of 0.105 M in formic acid and 5.0×10−2 M in hypochlorous acid
Find pH of 0.105 M in formic acid and 5.0×10−2 M in hypochlorous acid