Which of the following 0.10M solutions have pH > 7? W. NH4I X. BaCl2 Y. KNO3...

Question

Question

Which of the following 0.10M solutions have pH > 7?

W. NH4I

X. BaCl2

Y. KNO3

Z. NaF

A. W only

B. Z only

C. Y and Z

D. W and X

E. X and Y

Answer 1

Answer #1

The answer is B. Z only.

Only NaF has pH > 7. NaF is the salt of a weak acid (HF) and a strong base (NaOH). Thus, the solution of NaF is slightly basic.

NH4I is the salt of a strong acid (HI) and a weak base (NH3). Thus it's solution is slightly acidic.

BaCl2 is the salt of a strong acid (HCl) with a strong base (Ba(OH)2). Thus, the solution of BaCl2 is neutral.

KNO3 also is the salt of a moderately strong acid(HNO3) and a strong base (KOH). Thus, it's solution is almost neutral.

Answer 2

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