2. How much NaCl is needed to make 300 mL of a 0.5 M solution? 3. If you added 1

Question

2. How much NaCl is needed to make 300 mL of a 0.5 M solution? 3. If you added 125 g of NaCl to water to make a 1 M solution, what was the total volume of your solution? 4. How many grams of sodium sulfate (Na2SO4) are required to prepare a 350 mL solution whose concentration is 0.683 M? The molecular weight of sodium sulfate is 142.1 g/mol. 5. How many grams of ethanol (C2HOH) are present in 85 mL of a 0.451 M ethanol solution? The molecular weight of ethanol is 46.07 g/mol. How many grams of NaOH are required to make 400 mL of a 2.8 M solution? The molecular weight of NaOH is 40 g/mol. 6. , You have 75 g NaOH in 800 mL. of solution. What is the molarity of the solution? The molecular weight of NaOH is 40 g/mol.

Explanation / Answer

For 1M, 1L NaCL solution-----------------------------------------58.44g NaCL required

For [1M/2=0.5M] , 1L NaCL solution---------------------------[58.44/2 = 29.22]g NaCL required (dividing by 2 on both the sides)

For 0.5M, 1000mL NaCL solution-------------------------------- 29.22g NaCL required (interchanging 1L to 1000mL)

For 0.5M, 1000mL/1000*300= 300mL, NaCL solution----- 29.22g/1000 *300 = 8.766 g NaCL required

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