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A chemist uses 0.25 L of 2.00 M H2SO4 to completely neutralize a 2.00 L of solution of NaOH. The balanced chemical equation of the reaction is given below. 2NaOH + H2SO4 mc012-1.jpg Na2SO4 + 2H2O What is the concentration of NaOH that is used?

2 Answers

4 votes

Answer:

0.5 M is the concentration of NaOH used.

Step-by-step explanation:

Considering:


Molarity=(Moles\ of\ solute)/(Volume\ of\ the\ solution)

Or,


Moles =Molarity * {Volume\ of\ the\ solution}

Given :

For
H_2SO_4 :

Molarity = 2.00 M

Volume = 0.25 L

Thus, moles of
H_2SO_4 :


Moles=2.00 * 0.25\ moles

Moles of
H_2SO_4 = 0.5 moles

According to the given reaction:


2NaOH + H_2SO_4\rightarrow Na_2SO_4 + 2H_2O

1 mole of
H_2SO_4 reacts with 2 moles of
NaOH

0.5 mole of
H_2SO_4 reacts with 2*0.5 moles of
NaOH

Moles of
NaOH = 1.0 moles

Given that volume of NaOH reacted = 2.00 L

So,


Molarity=(Moles\ of\ solute)/(Volume\ of\ the\ solution)


Molarity=(1.0)/(2.00)\ M=0.5\ M

0.5 M is the concentration of NaOH used.

User Bishnu Bhusal
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2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O

c₁=2.00 mol/L
v₁=0.25 L
v₂=2.00 L
c₂-?

n(NaOH)=c₂v₂
n(H₂SO₄)=c₁v₁
n(NaOH)=2n(H₂SO₄)

c₂v₂=2c₁v₁

c₂=2c₁v₁/v₂

c₂=2*2.00*0.25/2.00=0.5 mol/L

0.5 M NaOH


User Bigger
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8.6k points