If i add water to 100 mL of a 0.75 M NaOH solution un til the final volume is 165mL what will the molarity of the diluted solution be

Question

Chemistry

Nayeli Wong

26 February, 20:47

If i add water to 100 mL of a 0.75 M NaOH solution un til the final volume is 165mL what will the molarity of the diluted solution be

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Jaydan Velazquez · Answer 1

Answer is: the molarity of the diluted solution 0,454 M.

V₁ (NaOH) = 100 mL : 1000 mL/L = 0,1 L.

c₁ (NaOH) = 0,75 M = 0,75 mol/L.

n₁ (NaOH) = c₁ (NaOH) · V₁ (NaOH).

n₁ (NaOH) = 0,75 mol/L · 0,1 L.

n₁ (NaOH) = 0,075 mol

n₂ (NaOH) = n₁ (NaOH) = 0,075 mol.

V₂ (NaOH) = 165 mL : 1000 mL/L = 0,165 L.

c₂ (NaOH) = n₂ (NaOH) : V₂ (NaOH).

c₂ (NaOH) = 0,075 mol : 0,165 L.

c₂ (NaOH) = 0,454 mol/L.