t tie bilenalve that best completes the statement or answers the question. t the

Question

t tie bilenalve that best completes the statement or answers the question. t the concentration of the hydronium ion is 1.5 x 10-5 M? A) 1.0 × 10-19 M )1.5 × 109 M C) 6.7 x 10-10 M D) 1.0 × 10-14 M E) none of the above 2) What is the pOH of a solution that has a OH- concentration equal to 1.3 10-10 M? 4.12 .89 C)-4.3 D) 4.29 E) none of the above 3) Which of the following statements is TRUE for gases? 1. The temperature of a gas is inversely proportional to its pressure. 2. The volume of a gas is directly proportional to the pressure in torr 3. The pressure of a gas is due to collisions of the gas molecules. A) 2 only B) 1 only C)3 only and 2 only E) 1 and 3 only

Explanation / Answer

1.

we need

Kw = 10^-14

[H+][OH-] = Kw

if

[H+] = 1.5*10^-5

[OH-] = Kw/[h+] = (10^-14)/(1.5*10^-5) = 6.666*10^-10

choose C

3.

this is form ideal gases so

1, is false, since higher pressure, higher teperature expected

2. this is also false, since more pressure is less volume

3. this is also true, the more collisions, the higher pressure

then

choose only 3

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