Strong and weak acids and bases
Grade 10 Science Worksheet - Challenge Me
Circle the best answer, or write your answer on the line.
HCl and acetic acid are both 0.1 M. HCl ionizes completely, so its [H⁺] is 0.1 M; acetic acid's is 0.0013 M. About how many times more H⁺ does HCl have, Ari?
HCl and acetic acid are both 0.01 M. HCl ionizes completely, so its [H⁺] is 0.01 M; acetic acid's is 0.00042 M. About how many times more H⁺ does HCl have, Bo?
HCl and acetic acid are both 0.001 M. HCl ionizes completely, so its [H⁺] is 0.001 M; acetic acid's is 0.00013 M. About how many times more H⁺ does HCl have, Esme?
Acetic acid is 0.4% ionized at 1.0 M and 4.2% at 0.010 M. What does this show, Jun?
- Its Ka changes with concentration
- It turns strong when dilute
- More ionizes when it is dilute
Milo says acetic acid is weak because vinegar is mostly water. Agree or disagree?
- Disagree: weak means partly split
- Agree: water makes any acid weak
- Agree: weak just means watered down
Noah says 6 M acetic acid is a strong acid because it is concentrated. Agree or disagree?
- Agree: more acid means it splits more fully
- Disagree: it is concentrated but weak
- Agree: concentrated means strong
Pia says a strong acid has a lower pH than a weak acid, whatever their concentrations. Agree or disagree?
- Agree: strong acids win at any amount
- Agree: weak acids have pH above 7
- Disagree: concentration matters too
Citric acid is a weak acid. Why is lemon juice still about pH 2.2, Ren?
- Lemon juice has HCl in it
- Citric acid is a strong acid
- It holds plenty of citric acid
Milk of magnesia, Mg(OH)₂, is about pH 10.5, far milder than 1.0 M NaOH at 14.0. Why, Tala?
- It has no OH⁻ in it
- Mg(OH)₂ is an acid
- Little Mg(OH)₂ dissolves
Which pH fits 0.10 M acetic acid, Zee?
- About 1.0
- About 7.0
- About 2.9