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1. What happens when a strong acid suchas HBr dissolves in water? 2. What is the...

1. What happens when a strong acid suchas HBr dissolves in water?

2. What is the PH of a solution with [H+] of 3.6*10^-4?

3. A sample of urine has a pH 7.9. Is the sample acidic, basic, or neutral? What is the hydrogen ion concentration in the urine sample?

Solutions

Expert Solution

1) HBr is a gas when it dissolves in water we get a HBr(aq) which is a strong acid

When HBr dissociates in water you get this reaction

HBr(g) + H2O(l) --> H3O+ + Br-

The HBr, is the acid, the proton donor. Water is the proton acceptor, the base, and picks up the proton from HBr, producing H3O+, the hydronium ion, and leaving bromide ion in solution.

The hydronium ion is the conjugate acid, and the bromide ion is the conjugate base.

2) pH =-log [H+]

i.e. pH=-log[3.6 x 10-4]

pH=3.44

so pH of the solution with [H+] ion concentration of 3.6 x 10-4 is 3.44

3) By standar definition of pH. The pH scale measures how acidic or basic a substance is. It ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic, and a pH greater than 7 is basic

By this definition the urine sample with pH of 7.9 is basic.

pH = -log[H+]

7.9 = -log [H+]

[H+] = 10-7.9 = 1.26 x 10-8
so hydrogen ion concentration in urine sample is 1.26 x 10-8

queen_honey_blossom answered 2 years ago
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