Calculate the concentration of a solution which contains 1.96g of sodium hydroxide in a volume of 200cm3?
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Answer:
1 centimeter cubed or cm^3 = 1 milliliter. So the question is asking you, calculate the concentration of a solution which contains 1.96 grams of NaOh in 200 mL Since the Molarity of NaOH is approximately 40, and the definition of Molarity is grams of substance per Liter, then 1000 mL/200 mL = 5 This is saying the same thing as if 1.96 grams is contained in 200 mL then in 1 liter, there will be 5 times as much. 1 Liter of solution = 5 X 1.96 = 9.8 Grams per Liter And since the Molar concentration is 40 grams per mole or 40 grams per liter then: 9.8/40 = 0.245 Molar NaOH
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Other answers
Sodium hydroxide weighs 39.9971 g/mol, so there are 0.049 mol of sodium hydroxide in 1.96 g. 200cm^3 is 200 mL or 0.200 L. Divide the moles over the liters and you get 0.245 mol/L or M.
James
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