5ml of the 1000 ppm solution in 95ml distilled water gives a 500ppm solution
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To dilute 1000 ppm to 500 ppm, you need to add an equal amount of the solution without any concentration. For example, if you have 1 mL of the 1000 ppm solution, you would need to add 1 mL of water to make it 500 ppm.
To dilute a 10 ppm solution to 1 ppm, you would mix 1 part of the 10 ppm solution with 9 parts of a diluent (such as water). This would result in a 1 ppm concentration because the concentration has been decreased by a factor of 10 during the dilution process.
1000 ppm is equivalent to 1 milligram per milliliter.
Even a single drop of water will dilute 28 ppm of cyanide. Not by much, perhaps, but the question does not specify dilution to what degree.
To convert parts per billion (ppb) to parts per million (ppm), you divide by 1000. So, 28 ppb is equal to 0.028 ppm.
1000 ppm stands for "parts per million" and is used to express the concentration of a substance in a solution. In this case, it means that there are 1000 units of the substance for every million units of the solution.