Question: what is [po 4 3− ]/[a] (%) where [h 2 po 4 − ]/[a] (%) is 94.5?
SQL: SELECT "[PO 4 3− ]/[A] (%)" FROM "1-188378-1" WHERE "[H 2 PO 4 − ]/[A] (%)" = '94.5';

Question: what is the [a] (mol/l) where [hpo 4 2− ]/[a] (%) is 0.612?
SQL: SELECT COUNT("[A] (mol/L)") FROM "1-188378-1" WHERE "[HPO 4 2− ]/[A] (%)" = '0.612';