Question

Calculate the amount of NaOH required to produce 250ml of 5 Molar NaOH solution?​

Answer 1

The amount of NaOH required is 50 g

Explanation:

Given:

250 ml, 5 M NaOH solution

To find out:

The amount of NaOH required for this solution

Solution:

The given solution is 5M

i.e. in 1000 litres, there are 5 moles of NaOH

Thus, in 250 litres, the number of moles = (5/1000) × 250

                                                                    = 1.25 moles

Thus, the weight of NaOH required = moles × molecular weight

                                                           = 1.25 × 40 = 50 g

Hope this answer is helpful.

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Answer 2

Given:

250ml of 5 Molar NaOH solution has been provided.

To find:

Amount (i.e. mass) of NaOH required for the solution?

Calculation:

Now, we know that 5 M NaOH has 5 moles in 1 litre (i.e. 1000 mL) of solution.

So, moles of NaOH in 250 mL is:

$= \dfrac{5}{1000} \times 250$

$= \dfrac{5}{4}$

$= 1.25 \: moles$

Now, mass of NaOH needed:

$mass = mole \times (molar \: mass)$

$\implies \: mass = 1.25 \times 40$

$\implies \: mass = 50 \: g$

So, 50 grams of NaOH is needed.