What is the pH of a 0.015 M solution of pouMium hydroxide (KOH)? A. 1.8 B. 12.2

Question

What is the pH of a 0.015 M solution of pouMium hydroxide (KOH)? A. 1.8 B. 12.2 C. 5.6 D. 8.8 What is the [OH^-] of a solution with a pH of 9.0? A. 1 times 10^-5 M B. 1 times 10^-9 M C. 1 times 10^-4 M D. 1 times 10^-7 M A pH scale reading of____indicates a weak base. A. 7 B. 2 C. 13 D. 6 Under standard conditions, Molarity is equal to? A. 1M B. 0.05M C. 0M D. 0.01M All of the following have a standard Delta G degree of formation value of zero al 25 degree C and 1.0 atm except: A. N_2(g) B. Fe(s) C. Pb(s) D. H(g)

Explanation / Answer

1) PH=-logH+

for 0.015M ,KOH solution

KOH---------------------->[K]+ + [OH]-

[OH]-=-log [OH]-=-log[0.015]=-(-1.82)=1.82

therefore

PH + POH=14

PH=14-PH=14-1.82=12.18

ANS is 12.18

2) OH of 9 PH solution

PH+POH=14

OH-=14-9=5

OH-=-log [OH]-=-log(5)=1 X10-5M

3) PH range for weak base indicator is 2, because weak base behave as strong acid or vice varsa.

4) Under standerd condition molarity equals to 1M.

5) All the N2(g), Fe(s), Pb(s) and H(g) have the delta G value is zero at zero and one atm.

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