Which of the following solutions have the same concentration

Asked by admin @ 12/08/2021 in Chemistry viewed by 311 People

Which of the following solutions have the same concentration?

(1) 20g of NaOH in 200 ml of the solution(2) 0.5 mol of KCl in 200ml of the solution(3) 40g of NaOH in 100ml of the solution(4) 20g of KOH in 200ml of solution

Answered by admin @ 12/08/2021

1.

mass of NaOH = 20g

volume of solution = 200 ml

m by v % = Mass of solute / volume of solution × 100

==> m by v % = 20/200 × 100

==> m by v % = 10 %

2.

molar mass of KCl = 39.05 + 35.5 ==> 74.55 g

mass of KCl = 0.5 × 74.55 ==> 37.275 g

volume of solution = 200 ml

m by v % = mass of solute / volume of solution × 100

m by v % = 37.275/200 × 100

==> m by v % = 37.275/2

==> m by v % = 18.63 %

3.

mass of NaOH = 40g

volume of solution = 100 ml

m by v % = mass of solute / mass of solution × 100

m by v % = 40/100 × 100

==> m by v % = 40 %

4.

mass of KOH = 20g

volume of solution = 200 ml

m by v % = mass of solute / volume of solution × 100

==> m by v % = 20/200 × 100

==> m by v % = 10 %

From the above calculations,

(1) and (4) will have same concentration.

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