# If a sulfuric acid solution is reported as "3 Normal", what is its molar concentration?

Jan 17, 2018

Is $1.50 \cdot m o l \cdot {L}^{-} 1$ with respect to $\text{sulfuric acid} \ldots .$

#### Explanation:

$\text{Normality}$ is an old-fashioned word, and refers to the number of equivalents of base an acid requires for neutrality...

Of course $\text{sulfuric acid}$, and $\text{phosphoric acid}$ ARE diprotic acids...and will require 2 equiv of base for equivalence...

${H}_{2} S {O}_{4} \left(a q\right) + 2 N a O H \left(a q\right) \rightarrow {\underbrace{N {a}_{2} S {O}_{4} \left(a q\right) + 2 {H}_{2} O \left(l\right)}}_{\text{a normal solution}}$

${H}_{3} P {O}_{4} \left(a q\right) + 2 N a O H \left(a q\right) \rightarrow {\underbrace{N {a}_{2} H P {O}_{4} \left(a q\right) + 2 {H}_{2} O \left(l\right)}}_{\text{a normal solution}}$

And so if the sulfuric acid is reported at $3 \cdot N$...its actual concentration is $1.50 \cdot m o l \cdot {L}^{-} 1$...