Grade 10 · Science · Chemistry

10th grade What makes an acid or a base worksheet

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What makes an acid or a base

Grade 10 Science Worksheet

NameDate

Circle the best answer, or write your answer on the line.

Citric acid, C₆H₈O₇, has 8 hydrogen atoms and gives up one H⁺. How many hydrogen atoms does its first conjugate base have, Bo?
Sulfuric acid, H₂SO₄, has 2 hydrogen atoms and gives up one H⁺. How many hydrogen atoms does HSO₄⁻, its conjugate base, have, Esme?
3.
In the Brønsted–Lowry model, what is an acid, Jun?
- An OH⁻ donor
- A proton donor
- A proton acceptor
4.
In HCl + H₂O → H₃O⁺ + Cl⁻, which reactant accepts the proton, Kira?
- HCl
- H₂O
- Neither reactant
5.
In NH₃ + H₂O → NH₄⁺ + OH⁻, what does water do, Luz?
- Hands NH₃ a whole OH⁻ ion
- Donates a proton to NH₃
- Accepts a proton from NH₃
6.
What is the conjugate base of acetic acid, CH₃COOH, Milo?
- CH₃COO⁻
- OH⁻
- CH₃COOH₂⁺
7.
What is the conjugate acid of ammonia, NH₃, Noah?
- NH₂⁻
- H₃O⁺
- NH₄⁺
8.
In HCl + H₂O → H₃O⁺ + Cl⁻, which two form a conjugate acid-base pair, Pia?
- HCl and H₂O
- HCl and Cl⁻
- Cl⁻ and H₃O⁺
9.
Milk of magnesia is mostly Mg(OH)₂. Why does it count as an Arrhenius base, Ren?
- It has no hydrogen atoms in it
- Its Mg²⁺ ions donate protons
- It gives OH⁻ ions in water
10.
Ammonia, NH₃, has no OH⁻ in its formula. Why is it still a base, Tala?
- It donates a proton to water
- It accepts a proton from water
- It gives off H⁺ in water

What makes an acid or a base. Every version has 10 questions, and the answer key prints on the second page.

I can use Arrhenius's definitions: acids make H⁺ in water, bases make OH⁻.
I can use the Brønsted–Lowry definitions: acids donate protons, bases accept them.
I can write conjugate acids and bases, which differ by one H⁺, and find conjugate pairs in an equation.
I can sort household liquids as acidic, neutral or basic from their pH.

Standard: none (TX, FL)

acid (Arrhenius): A substance that makes H⁺ ions in water

base (Arrhenius): A substance that makes OH⁻ ions in water

acid (Brønsted–Lowry): A proton (H⁺) donor

base (Brønsted–Lowry): A proton acceptor

conjugate pair: An acid and base that differ by one H⁺

amphiprotic: Able to donate or accept a proton, like water

Your child added the units and the ions each one gives. Each unit gives the same number, so multiply.

Your child added a proton (H⁺) instead of removing it. A conjugate base is the acid with one H⁺ taken away.

Your child thought a base must contain OH⁻. In the Brønsted–Lowry model, a base is anything that accepts a proton.

What is the most common mistake with what makes an acid or a base?

Your child added the units and the ions each one gives. Each unit gives the same number, so multiply.

Are these 10th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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