Question 1

What is the pH of 0.20M aqueous HF?
Ka = 6.8x10^-4

(A) 0.93

(B) 1.93

(C) 2.93

(D) none of the above

Your response

Not answered yet

Question 2

What is the pH of 0.0050M aqueous HF? Ka = 6.8x10-4

(A) 0.82

(B) 1.82

(C) 2.8

(D) none of the above

Your response

Not answered yet

Question 3

Which one is more acidic, 0.2MHF or 0.02MHCl?

(A) HF

(B) HCl

(C) same acidity

(D) none of the above

Your response

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Question 4

What is the pH of 0.04M of NH₄Cl?
Ka=5.6x10^-10

(A) 3.565

(B) 4.545

(C) 5.325

(D) none of the above

Your response

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Question 5

A 0.10M solution of lactic acid (HC₃H₅O₃, one acidic hydrogen) has a pH of 2.45. What is the Ka for lactic acid?

(A) 1.3e-4

(B) 1.3e-5

(C) 1.3e-6

(D) none of the above

Your response

Not answered yet