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Weigh 0.4675 g of NaCl, dissolve and fill to 400 mL.
n = c · V = 0.008m = n · M = 0.46752Open this in the calculator to change the numbers.
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Use 16.67 mL of the HCl and fill to 200 mL.
n = c · V = 0.2Vstock = c · V / Cstock = 0.01667Open this in the calculator to change the numbers.
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That is 8.679 g of Ethanol.
m = ρ · V · 1000 = 8.679Open this in the calculator to change the numbers.
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That is 0.1513 mol of NaCl.
n = m / M = 0.1513Open this in the calculator to change the numbers.
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Weigh 2.192 g of NaCl, dissolve and fill to 500 mL.
n = c · V = 0.0375m = n · M = 2.1915Open this in the calculator to change the numbers.
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Use 4.167 mL of the HCl and fill to 100 mL.
n = c · V = 0.05Vstock = c · V / Cstock = 0.004167Open this in the calculator to change the numbers.
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That is 9.468 g of Ethanol.
m = ρ · V · 1000 = 9.468Open this in the calculator to change the numbers.
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Weigh 0.3506 g of NaCl, dissolve and fill to 300 mL.
n = c · V = 0.006m = n · M = 0.35064Open this in the calculator to change the numbers.
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Use 10 mL of the HCl and fill to 100 mL.
n = c · V = 0.1Vstock = c · V / Cstock = 0.01Open this in the calculator to change the numbers.
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That is 7.101 g of Ethanol.
m = ρ · V · 1000 = 7.101Open this in the calculator to change the numbers.
More solutions practice
Weighed the wrong amount? Get the volume to dissolve it in to hit your target.
Protocol assumes one hydrate, you have another? Get the corrected mass.
N = M × n, with the equivalence factor you confirm for the reaction.
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