### Organic Chemistry Calculations, Solution & Solute – Chemistry

The key terms of this Chemistry Quiz include Solution & Solute, Acid, Chemical Equation.

To measure the amount of iron in a certain type of iron ore, an analytical chemist dissolves a 28.00 g sample in strong acid and titrates it to the endpoint with 103. mL of 0.160 M potassium permanganate (KMnO4) solution.

The balanced chemical equation for the reaction is:

8H+(aq) + 5Fe+2(aq) + MnO4(aq) —à 5Fe+3(aq) + Mn+2(aq) + 4H2O(l)

Imagine a small amount of each compound in the table below is dissolved in water. Pick the sketch that best shows what the solution would look like, at the atomic level.

The large number of faint red and white molecules in the background of each sketch represent the water solvent. Also, the colors of the solute atoms may not mean the same element in each sketch. For example, solute oxygen atoms could be colored yellow in the first sketch but blue in the second. Chlorine atoms could be colored blue in the first sketch but yellow in the second. And so on.

Note for advanced students: the sizes of the atoms and any bond angles may not be accurate.

The following chemical reaction takes place in aqueous solution:

2 AgNO3(aq) + K2CO3(aq) —à Ag2CO3(s) + 2 KNO3(aq)

Write the net ionic equation for this reaction.

2 Ag+(aq) + CO32-(aq) —> Ag2CO3(s)

Complete the table below by deciding whether a precipitate forms when aqueous solutions A and B are mixed. If a precipitate will form, enter its empirical formula in the last column.

Classify each chemical compound listed in the table below.

#### Solution & Solute – Organic Chemistry Quiz

Classify each chemical reaction:

Suppose 6.63 g of potassium bromide is dissolved in 150. mL of a 0.20 M aqueous solution of silver nitrate.

Calculate the final molarity of potassium cation in the solution. You can assume the volume of the solution doesn’t change when the potassium bromide is dissolved in it.

0.371 M

A chemistry student needs to standardize a fresh solution of sodium hydroxide. She carefully weighs out 390. mg of oxalic acid (H2C2O4), a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in 250. mL of distilled water. The student then titrates the oxalic acid solution with her sodium hydroxide solution. When the titration reaches the equivalence point, the student finds she has used 99.9 mL of sodium hydroxide solution.

Calculate the molarity of the student’s sodium hydroxide solution. Round your answer to 3 significant digits.

0.0867 M

To measure the amount of iron in a certain type of iron ore, an analytical chemist dissolves a 28.00 g sample in strong acid and titrates it to the endpoint with 103. mL of 0.160 M potassium permanganate (KMnO4) solution.

The balanced chemical equation for the reaction is:

8H+(aq) + 5Fe+2(aq) + MnO4(aq) —à 5Fe+3(aq) + Mn+2(aq) + 4H2O(l)

Imagine a small amount of each compound in the table below is dissolved in water. Pick the sketch that best shows what the solution would look like, at the atomic level.

The large number of faint red and white molecules in the background of each sketch represent the water solvent. Also, the colors of the solute atoms may not mean the same element in each sketch. For example, solute oxygen atoms could be colored yellow in the first sketch but blue in the second. Chlorine atoms could be colored blue in the first sketch but yellow in the second. And so on.

Note for advanced students: the sizes of the atoms and any bond angles may not be accurate.