Answer:
4,25% v/v H3PO4
Explanation:
The concentration of phosphoric acid (H3PO4) is expressed as a volume / volume percentage, which means:
%v/v H3PO4 = (mL of pure H3PO4/mL of solution)*100%
In other words, <u>we are only interested in the final volume of the solution to which the phosphoric acid was diluted, regardless of its composition</u>. Which in this case is 1 L (1000 mL).
We can then apply the following equation, commonly used to calculate the initial or final concentration (or volume) of a substance when it is diluted:
Ci*Vi=Cf*Vf
<u>Where</u>:
Ci, is the initial concentration of the substance.
Vi, the initial volume of the substance
Cf, the final concentration reached after dilution
Vf, the final volume of the solution at which the substance was diluted
In this case, the incognite would be the final concentration of H3PO4 reached after dilution, that is, Cf. Therefore, we proceed to clear Cf from the previous equation and replace our data:
Cf = (Ci*Vi)/Vf = (85% v/v * 50 mL)/1000 mL = 4,25 % v/v
Note that being up and down in the division, the mL unit is canceled to result in% v / v.
