An aqueous solution contains 300 parts per million of KOH. Determine the number of grams of KOH present in 1000 grams of this soulution

To determine the number of grams of potassium hydroxide, we need to know what is the units of parts per million and what it means. Then, we can multiply the grams of solution to obtain the grams KOH. Parts per million (ppm) means that there is 1 mass unit of solute per 1 million mass units of solution. Therefore,

300 ppm = 300 g KOH / 1000000 g solution

mass KOH = 300 g KOH / 1000000 g solution (1000 g solution)

mass KOH = 0.3 g KOH