Question

What will be the molarity of a solution containing 5g of sodium hydroxide in 250ml solution

a.0.5

b.1.0

c.2.0

d.0.1?

Answer 1

C= n/v

n= m/M = 5g/40 =1/8= 0.125moles

C=n/v = 0.125/0.25 = 0.5
so the answer is a) 0.5M

Answer 2

The quantity of solution in a given volume of solution is measured in molarity (M).

Given:

• Mass Of Sodium Hydroxide (NaOH) = 5g
• Volume of Solution = 250ml
• Molecular weight of NaOH = 40g per mole

To find:

• Molarity of the solution =?

Formula used:

Molarity = $Mass/Molecular weight * 1000/Volume in ml$

Step by Step explanation:

• Molarity = $\frac{5}{40} * \frac{1000}{250}$ = 0.5

Answer:

The molarity of a solution having 5g NaOH in 250ml solution is 0.5.

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