The amount of salt in water is measured in parts per million (ppm), where 1 ppm is equivalent to 1 g of salt present in 1,000,000 g of solution.
Dylan tested some water from his bore. He heated a 2,000 g sample of bore water. After all the water was evaporated, he was left with 10.4 g of salt. What was the concentration of Dylan's bore water?
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Answer:
PPM can be better understood in typical units of concentration!
PPM can also be represented as mg/L!
Assuming the density of water is 1.0g/ml, we can translate 500.0g of water to be 500.0mL of water!
Therefore,
Turning 500.0mL of water into L first;
500 mL
⋅
1 L
1000 mL
=
0.5 L
For PPM, we want to keep our mass in mg, which was already supplied!
As such,
45 mg
0.5 L
=
90 mg/L
=
90 ppm
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