# How many grams of H_3PO_4 is needed to prepare 550 mL of a 0.31 N solution? (assume all H^+ enter...

## Question:

How many grams of {eq}\rm H_3PO_4 {/eq} is needed to prepare 550 mL of a 0.31 N solution? (assume all {eq}\rm H^+ {/eq} enter reaction)

A. 5.6.

B. 1.9.

C. 1.7.

## Concentration:

When using the acid-base reaction and redox reaction, it is easier to use the normality of the solution rather than the molarity because, in the normal concentration, the factor in which the compound will react as an acid, base, reducing agent, or oxidizing agent is already included.

## Answer and Explanation: 1

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First, we have to calculate the molar concentration of the solution. For every mole of {eq}H_3PO_4 {/eq}, there are three equivalents of hydrogen...

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