Question

How many grams of naoh are needed to make 100ml. Of a 0.5 m solution of naoh ?

Answer 1

Answer:

100 ml of 0.5 M NaOH contains =40x 100/1000 x 0.5= 2- grams. So to prepare 100 ml of 0.5M NaOH, dissolve 2- grams of NaOH in a 100 ml standard flask in distilled water.

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Answer 2

How many grams of NaOH are needed to make 100ml. Of a 0.5 m solution of NaOH?

2 grams of NaOH is needed to make 100 ml of a 0.5 M solution

To Find:

Grams of NaOH that is needed to make 100ml of a 0.5 M solution of NaOH.

Solution:

We know,

1 mole of NaOH = 40 gm of NaOH

0.5 mole of NaOH = 40 × 0.5 i.e, 20 gm of NaOH

Now,

Number of moles in 100 ml solution = (0.5 × 100)/1000

= 0.05

We know,

Molarity = number of moles of solute/ Volume of the solution

and,

Number of moles  = mass / molar mass

or, mass of NaOH = 0.05 × 40 = 2 gram

Thus 2 grams of NaOH is needed to make 100 ml of a 0.5 M solution.

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