Equation given H2SO4+2NaOH -->  Na2SO4+2H2O; what volume of 3.00 M sulfuric acid would be necessay to neutralize and dissolve 2.5kg of solid sodium hydroxide?

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mlsiasebs's profile pic

mlsiasebs | College Teacher | (Level 1) Associate Educator

Posted on

The first thing to do is to make sure we have a balanced chemical equation, which was given in the problem. This is an acid-base reaction but it's still just a stoichiometry problem in that we have to worry about the moles of each substances.

Since we are given the mass of NaOH, we can find the moles of NaOH. ONce we know the moles, we can use the mole ratio from the balanced chemical equation to see that for every 1 mole of H2SO4, we will need 2 moles of NaOH.

We can set up our calculation, paying careful attention to theunitsto make sure they cancel out and that we end up with a volume. Remember that molarity (M) is moles of solute per liter of solution. Rewriting as mol/L will help us see how we need to use it in the equation.

2.5 kg NaOH(1000 g/1 kg)(1 mol NaOH/40 g)(1 mol H2SO4/2 mol NaOH)(1 L/3.00 mol H2SO4)

Once we cancel out our units, we get L which is a volume and what the problem is asking for.

The answer is 10.4 L H2SO4

chaobas's profile pic

chaobas | College Teacher | (Level 1) Valedictorian

Posted on

The balanced reaction is 

H2SO4+2NaOH -->  Na2SO4+2H2O

 

Mass of NaOH is given as 2.5 kg = 2500 g

And molar mass of NaOH is 40 g/mol

Moles = mass/molar mass

moles of NaOH = 2500 g/ (40g/mol) = 62.5 mol NaOH

If we look at the reaction, 1 mol of H2So4 requries 2 mol NaOH for neutrilization. That is the molar artio is 1 mol H2SO4 : 2 mol NaOH

 

So moles of H2So4 requries for neutrilization of 62.5 mol NaOH would be

62.5 mol NaOh * (1 mol H2SO4/ 2 mol NaOH)

31.25 mol H2SO4.

 

Here the concentration of H2sO4 IS 3 M

 

nOW

Molarity = moles/volume(liter)

Voilume(liter) = Moles/molarity

Volume of H2SO4 = 31.25 mol H2SO4/ 3 M = 10.42 L

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