Question

Q1.Calculate the amount of NaOH required to produce 250ml of 5 Molar NaOH solution?​

Answer 1

Step-by-step explanation:

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:

$= \dfrac{5}{1000} \times 250</p><p>$

$</p><p>= \dfrac{5}{4}</p><p></p><p> </p><p></p><p>= 1.25 \: moles=</p><p>$

Now, mass of NaOH needed:

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

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

⟹mass=50g

So, 50 grams of NaOH is needed.

Answer 2

Answer:

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