Question

1) 4g of NaOH is dissolved in water and the volume is made up to one litre. (l mole of NaOH = 409) a) Calculate the molarity of the resultant solution. b) How will you make IM solution of NaOH using the same amount (4g) of NaOH ?​

Answer 1

Answer:

Solution

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1 mol of NaOH has a mass of 40g. So

Moles of NaOH=1.6g of NaOH×

40gNaOH

1molNaOH

=0.04 mol NaOH

Litres of solution =500ml solution ×

1000mlSolution

1LSolution

=0.5 L Solution

Molarity =

litresofsolution

molesofSolute

=

0.5

0.04

mol/L

=0.08 mol/L