Burt Cheevers: Don't have the patience to do the actual math, but I believe the formula would be as follows with 'x' equaling the number of gallons needed @ a 15% solution and 'y' equaling the number of total gallons at a 30% solution. Solve for y first and then solve for x to get the actual number. Hope it helps..15(x) + .4(5) = .3(y)...Show more
Palmira Lochridge: Concentration is the quantity of solute (on this case, acid) within the entire resolution. So you already know that 20% of the seventy five mL is acid. So you will have .two*seventy five mL, or 15 mL of natural acid. You even have the forty mL of natural acid already within the beaker. So whole, you will have fifty five mL natural acid. That's the quantity of solute. The entire resolution is the seventy five mL plus the forty mL, or a hundred and fifteen mL. To discover the attention, simply divide fifty five / a hundred and fifteen, which offers you .478, or forty seven.eight%...Show more
Madlyn F! allis: 15 gallons
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