Question

80 gram of NaOH is added to sufficient amount of water to make final volume as 5000 ml. 20 ml of this solution is mixed with 20 ml of water. Find molarity of final solution. ​

Answer 1

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Molarity is a concentration term in which the no. of moles and the volume are related.

Molarity (c)=no. of moles (n)volume in L (V)

Here

n=10 g40 g/mol

V=500 mL=0.5 L

So

c=nV

=10 g40 g/mol × 0.5 L

=10 mol20 L=0.5 molar

Answer 2

Molarity is a concentration term in which the no. of moles and the volume are related.

Molarity (c)=no. of moles (n)volume in L (V)

Heren=10 g

40 g/molV=500 mL

=0.5 L

Soc=nV=10 g

40 g/mol × 0.5 L=10 mol

20 L=0.5 molar