Solutions & Titrations - 1) What is the molarity of a solution made by dissolvin

Question

Solutions & Titrations -

1) What is the molarity of a solution made by dissolving 3.00g of sodium hydroxide, NaOH, in enough water to make 350 mL of solution?

2) How many mL of 0.500 M solution can be prepared by dissolving 5.00g of NaCl in water?

3) How many grams of Na2CO3 are needed to prepare 750 mL of 2.50 M Na2CO3?

4) A 10.00 mL sample of HCl is neutralized by 24.65 mL of 0.200 M NaOH in a titration. What is the molarity of the acid? (Write a balanced equation.)

5) A 10.00 mL smaple of H2CO3 is neutralized by 16.20 mL of 0.100 M NaOH in a titration. What is the molariry of the acid? (Write a balanced equations.)

Explanation / Answer

1)

Molar mass of NaOH,

MM = 1*MM(Na) + 1*MM(O) + 1*MM(H)

= 1*22.99 + 1*16.0 + 1*1.008

= 40 g/mol

mass,m = 3.00 g

number of mol,

n = mass/molar mass

= 3.0/40

= 0.075 mol

volume , V = 350 mL = 0.35 L

Molarity,

M = number of mol / volume in L

= 0.075/0.35

= 0.214 M

Answer: 0.214 M

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