Question

To prepare 0.20M NaOH (40.0 g/mol) you will need to dilute 34g of NaOH to ___mL.

Answer 1

Answer –

In this question we need to calculate the how much volume we need to require to prepared 0.20M NaOH for the 34 g of NaOH

So, first we need to convert the given mass of NaOH to its moles

We know,

Moles = given mass / molar mas

So, moles of NaOH = 34 g of NaOH / 40.0 g.mol^-1

                                 = 0.85 moles of NaOH

We also know the molarity means moles/L, so

Molarity = moles / volume (L)

So, volume (L) = moles / molarity

                         = 0.85 moles / 0.20 M

                         = 4.25 L

Now we need to convert the volume L to mL

We know,

1 L = 1000 mL

So, 4.25 L = ?

= 4.25*10³ mL

To prepare 0.20M NaOH (40.0 g/mol) you will need to dilute 34g of NaOH to 4.25*10³ mL.