Question

what is the concentration in in moles of sodium hydroxide per dm3 of solution Contains 120g of sodium hydroxide in 100cm3 of solution.{H=1, O=16, Na=23} .​

Answer 1

Answer:

Given, Mass of NaOH in 100 ml of soln = 120 g

No. Of moles of Na in 100 ml soln = GM/MM

=120/40 = 3

No. Of moles in 1 dm³ soln = 30

(1 dm³ = 1 L)

Hence the molarity becomes 30 M

Or you can use Molarity = 1000×GM÷MM× volume(in ml)

Note:- GM => Given mass

MM => molar mass

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