Question

Someone please help
Problems:

1. Determine the pH of the following solutions and label each answer as acid, base or neutral:


a) A 4.5 x 10-3 M HBr solution.



b) A 3.67 x 10-5 M KOH solution.



c) What is the pH of a solution that has a [H+] concentration of 4.5 x 10-7 M?




d) What is the pH of a solution that has a [H+] concentration of 0.457 M?




e) What is the pH of a solution that has a [H+] concentration of 0.0056 M?

Answer 1

HBr is a Strong Acid, so it will completely dissociate. The ph would be -log (4.5E-3) which is 2.35

Answer 2

KOH, is a strong base so it completely dissociates. the ph would be -log(3.67E-5) which works out to be 4.44

Answer 3

pH= -log(H+) which is H3O+ so you would plug in the number and the answer should be 6.37for the pH

Answer 4

Question D and E are similar to Question C. Just plug in the numbers into the formula and you should get the pH

Answer 5

lol whats the answer

Answer 6

@supersurgeom365 whats the last answers

Answer 7

@Bettymcnightt You would plug the numbers into the formula -log[H+]. D) should be 0.3400838. Use appropriate significant figures. E) should be 2.25181197.
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