What volume of 0.25 M hydrochloric acid (HCl) solution contains 0.15 mol HCl? A.

Question

What volume of 0.25 M hydrochloric acid (HCl) solution contains 0.15 mol HCl?

A. 6.0 mL

B. 60 mL

C. 600 ml

D. 1.7 L

E. 170 mL

If 100 mL of 3.0 M solution were diluted to 250 mL, what would the concentration be?

A. 12 M

B. 120 M

C. 1.2 M

D. .012 M

E. 0.012

Which contains more solute particles: a 0.10 M aqueous solution of methanol (CH3OH) or a 0.10 M aqueous solution of salt (NaCl)?

A. Same number of particles

B. Salt contains 2x as many particles as methanol solution

C. The methanol solution contains three times as many particles as the salt solution.

D. Neither solution contains solute particles.

E. The methanol solution contains twice as many particles as the salt solution.

Explanation / Answer

What volume of 0.25 M hydrochloric acid (HCl) solution contains 0.15 mol HCl?

Solution:

Molarity = Moles /liter of solution

Volume of HCl solution = Moles / Molarity

Volume of HCl solution = 0.15 moles /0.25M

Volume of HCl solution = 0.6L = 600ml

So option 'C' is the correct answer.

2. If 100 mL of 3.0 M solution were diluted to 250 mL, what would the concentration be?

Solution:

Law of dilution : M1V1 = M2V2

3.0M *100ml = M2 *250ml

M2 = 1.2M

So option 'C' is the correct answer.

3. Which contains more solute particles: a 0.10 M aqueous solution of methanol (CH3OH) or a 0.10 M aqueous solution of salt (NaCl)?

Solution:

Methanol is molecular compound so it will not dissociate into ions while NaCl is ioninc compound which will dissociate into Na+ and Cl- ions so correct answer is "Salt contains 2x as many particles as methanol solution"

So correct answer is option 'B'

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