I think the answer is Option A
The answer is B.Desertification
A common factor is low pressure system.
Assuming no other acid is in the H3PO4 mix, then
<span>a) the equation </span>
<span>2H3PO4 + 3Ba(OH)2>>3H2O+Ba3(PO3)2 </span>
<span>titration equation: </span>
<span>nb*Ma*Va=na*Mb*Vb </span>
<span>nb*molesacid=na*molesbase </span>
<span>3*75*.175/98=2*Molaritybase*.215
</span><span>0.927 mol/L</span>