Sir Jas asked in Science & MathematicsChemistry · 5 months ago

# How many grams, i needed for NaOH?

Current chemical use (Liquid Type)

48% NaOH amount 2liter

(48g Sodium hydroxide + 52g Water)

Plan to use

Sodium Hydroxide (M.Wt 40,00 g/mol)

Pellets type

How many grams i need to get 2liter as Current recipe?

Relevance
• 5 months ago

48% NaOH amount 2liter:

(48g Sodium hydroxide + 52g Water)

Plan to use Sodium Hydroxide (M.Wt 40,00 g/mol)

Pellets type How many grams i need to get 2liter as Current recipe?

This is not a well written question:

By itself: 48% NaOH is meaningless unless you specify whether you mean 48%m/m or 48%m/v

But seeing that you later specify 48g NaOH + 52g H2O - the solution must be 48%m/m

Then it is difficult , based solely on the information given , to work out how to make 2L of this solution . You do not know the volume of 48g NaOH dissolved in 52g water

From other data I have determined that a 48%m/m solution of NaOH has density = 1.510g/cm³

If you wish to produce 2.0L of such a solution , this will have mass :

Mass = 2.0L * 1000cm³  /L * 1.510g/cm³  = 3,020g solution

Mass of NaOH required = 48/100*3020 = 1,449.6g NaOH

Weigh out 1,449.6g NaOH and slowly add to approx .0L water . A large amount of heat will be generated . Slowly add the NaOH - allowing solution to cool between additions. When all the NaOH has been added , finally add sufficient water to have a final volume = 2.0L

You do not make the calculation: weigh out XXX g of NaOH and dilute in YYY g or cm³  of water. The "molecular weigh" or more correctly molar mass NaOH = 40g/mol is not required for this problem.