Saline is 9 g of salt per 1 kg of water. What ppm is this?

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efimia efimia · Answer 1 · 2018-10-03T07:19:58+02:00

Density of water is 1 kg/L

There is 9 g of salt per 1 kg of water, on converting mass of water into its volume, there will be 9 g of salt per litre of water

1 ppm is equal to mg per litre

Since, 1 mg = 0.001 g

Thus, 1 ppm is equal to 0.001 g per litre

1 g/ l will be [tex]\frac{1}{0.001}ppm[/tex]

Therefore, 9 g/l = [tex]9 \times \frac{1}{0.001}ppm = 9000 ppm [/tex]

Hence, concentration of saline in water is 9000 ppm.

blahblahmali blahblahmali · Answer 2 · 2018-10-03T11:28:02+02:00

ppm is used to give the concentration of a solution

ppm stands for parts per million. In this question we are calculating weight of salt in 1 kg of solution

1000 mg is equivalent to 1 g

then 1000 g is equivalent to 1 kg

therefore 10⁶ mg is equivalent to 1 kg

there's 9 g of salt in 1 kg of water

the total weight of the solution is 1 kg + 0.009 kg = 1.009 kg

so we need to find out how many mg of salt is in 1 kg of saline

1.009 kg of saline contains - 9000 mg

then 1 kg of saline contains - 9000 mg / 1.009 kg = 8920 mg/kg

mg/kg is called ppm

therefore concentration of saline is 8920 ppm