Question

1. A 10⋅mL volume of oxalic acid was titrated with a 34.40⋅mL volume of NaOH(aq) whose concentration was 0.250⋅mol⋅L−1. What was the mass of oxalic acid present in the initial 10⋅mL volume?

Answer: 0.5418 g

2. A 40.16⋅mL volume of sodium hydroxide solution with concentration of 0.1693⋅mol L−1 reached an endpoint with a quantity of oxalic acid. If the oxalic acid was initially dissolved in a 30.00⋅mL what was the concentration of oxalic acid?
Answer: 0.113 M

3. Calculate the molarity of a NaOH solution if 32.02 mL of the solution neutralizes 0.2262 g of oxalic acid dihydrate.

Answer: 0.112 M

4. Calculate the molarity of a sodium hydroxide solution if 10.42 mL10.42 mL of this solution are needed to neutralize 25.00 mL25.00 mL of 0.2043 M0.2043 M oxalic acid.
Answer:

5.What volume of a 0.3300-M solution of sodium hydroxide would be required to titrate 15.00 mL of 0.1500 M oxalic acid?
Answer:

6. Oxalic acid dihydrate, H2C2O4.2 H2O (molar mass = 126.07 g/mol) is often used as a primary standard for the standardization of an NaOH solution. If 0.147 g of oxalic acid dihydrate are neutralized by 23.64 mL of an NaOH solution, what is the molar concentration of the NaOH solution?

Answer:

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Answer 1

Sea water is a mixture of salts and water which cannot be separated except by evaporation. Therefore, sea water is considered homogeneous.

Sea water also contains mud, decayed plant, etc., other than salts and water, so it is heterogeneous also.