$$ \ text {3Na} _2 \ text {C} _2 \ text {o} _4 + \ text {k} _2 \ text {cr} _2 \ text {o} _7 + 4 \ text {h} _2 \ text {so} _4 \ row $$
$$ \ text {2cr (so} _4 \ text {)} _ 3 +\ text {3co} _2 +\ text {k} _2 \ text {so} _4 +\ text {3Na} _2 \ text {so}} _4 +7 \ text {h} {h} {o} $$
