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The formula for concentration is concentration = mass / volume
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Rearranged is concentration * volume = mass
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You want 250 cm3 volume at a concentration of 6.3 g/dm3
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Convert 250 cm3 to dm3, 250 / 1000 = 0.25
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So, add the numbers into the formula, 6.3 * 0.25 = 1.575
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So you want your end solution to have 1.575g mass of nitric acid in a volume of 250 cm3, in order to give you the 6.3 g/dm3 concentration they asked for
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Then, you find how much of the original solution you need to get 1.575g
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mass / concentration = volume
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1.575 / 63 = 0.025 dm3 = 25 cm3
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So you have 25 cm3 of your original solution, and it contains 1.575g, now you just need to dilute it until you get the correct volume and the concentration will then be correct
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So, you add 225 cm3 of water, giving you 250 cm3 solution (the volume the question asked for) - and it contains 1.575g
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You can then check it is at the correct concentration by doing mass / volume = concentration
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1.575 / 0.25 (250cm3 / 1000 to convert to dm3) = 6.3 g/dm3 concentration, which is what they asked for, so it works!
•
The formula for concentration is concentration = mass / volume
•
Rearranged is concentration * volume = mass
•
You want 250 cm3 volume at a concentration of 6.3 g/dm3
•
Convert 250 cm3 to dm3, 250 / 1000 = 0.25
•
So, add the numbers into the formula, 6.3 * 0.25 = 1.575
•
So you want your end solution to have 1.575g mass of nitric acid in a volume of 250 cm3, in order to give you the 6.3 g/dm3 concentration they asked for
•
Then, you find how much of the original solution you need to get 1.575g
•
mass / concentration = volume
•
1.575 / 63 = 0.025 dm3 = 25 cm3
•
So you have 25 cm3 of your original solution, and it contains 1.575g, now you just need to dilute it until you get the correct volume and the concentration will then be correct
•
So, you add 225 cm3 of water, giving you 250 cm3 solution (the volume the question asked for) - and it contains 1.575g
•
You can then check it is at the correct concentration by doing mass / volume = concentration
•
1.575 / 0.25 (250cm3 / 1000 to convert to dm3) = 6.3 g/dm3 concentration, which is what they asked for, so it works!
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