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MassachusettsChemistry

Module 5: Solutions, acids and bases

5 dot points across 5 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

What makes a solution acidic or basic, and how does the pH scale measure it?

Define acids and bases by hydrogen and hydroxide ions, describe the pH scale and its relationship to hydrogen ion concentration, and interpret pH values (MA STE supporting content, acids, bases and pH).
A standard-level answer on acids, bases, and the pH scale for Massachusetts high school chemistry: defining acids and bases by hydrogen and hydroxide ions, the 0 to 14 pH scale, how pH relates to hydrogen ion concentration, and the meaning of neutral, acidic, and basic, grounded in the framework's acid-base content.
12 min answer →

How do we measure the concentration of a solution and use it in chemical calculations?

Calculate molarity, use it to convert between moles and solution volume, prepare and dilute solutions, and carry out solution stoichiometry (MA STE supporting content, concentration and quantitative solution chemistry).
A standard-level answer on molarity and solution stoichiometry for Massachusetts high school chemistry: defining molarity, converting between moles and volume, the dilution relationship, and using molarity in stoichiometry, grounded in the framework's quantitative solution content.
13 min answer →

What happens when an acid reacts with a base, and how can we use that reaction to find an unknown concentration?

Write neutralization reactions producing a salt and water, and use titration data with solution stoichiometry to find an unknown concentration (MA STE supporting content, neutralization and titration).
A standard-level answer on neutralization and titration for Massachusetts high school chemistry: the acid-plus-base reaction that forms a salt and water, the titration procedure and endpoint, and using titration data with solution stoichiometry to find an unknown concentration, grounded in the framework's acid-base content.
13 min answer →

What physical and chemical properties distinguish acids from bases, and what is the difference between strong and weak?

Describe the characteristic properties of acids and bases, distinguish strong from weak acids and bases, and identify common examples (MA STE supporting content, properties of acids and bases).
A standard-level answer on the properties of acids and bases for Massachusetts high school chemistry: the characteristic physical and chemical properties of each, the difference between strong and weak, common examples, and the reactions of acids with metals and carbonates, grounded in the framework's acid-base content.
12 min answer →

What is a solution, what controls how much will dissolve, and how do we describe its concentration?

Define solute, solvent, and solution, explain the factors affecting solubility and the rate of dissolving, and describe solutions as dilute, concentrated, saturated, or unsaturated (MA STE supporting content, solutions and solubility).
A standard-level answer on solutions, solubility, and concentration for Massachusetts high school chemistry: the parts of a solution, the factors that affect solubility and dissolving rate, reading a solubility curve, and the language of dilute, concentrated, saturated, and unsaturated, grounded in the framework's solutions content.
12 min answer →