Respuesta :
M(molarity of the phosphoric acid solution)=0.13 mole/L
molarity is a measure of the concentration of solute in a solution.
EQUATION OF BALENCE REACTION---->
3NaOH + H3PO4 ---->Na3PO4+3H2O
n MOLE OF NaOH REQUIED n/3 MOLE OF H3PO4 to completely react.
formula required to find the molarity is
n= number of mole
M= molarity
V= volume
n=M×V
n= 0.2255 m×35.60 ml
n= 8.02 m mole.
and, mole of H3PO4 to completely react = n/3
=8.02 /3
=2.67 m mole
now, according to question-->
2.67 m mole=M×19.90 ml
concentation of the solute in phosphoric acid solution is 0.13 mole/L
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