That completely depends on how much solution you need to end up with.
If the solution is to be 1,000 ppm by weight (or mass), then you add 1 gram
of KCl to each liter of water.
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1000ppm = 1000mg per litre. this means 1g made up to a litre of solution.
1000 grams 1 kilogram = 1000 grams
1000 grams
(1000 grams) / (150 grams) = 6.66666667150 grams * 6.66666667 = 1 kilograms1 kilogram = 1000 grams
It takes 1000 milligrams to make a gram, which is why they are called "milli"grams.