Free Printable Acids Bases and Salts Worksheets - Free Printable
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Step-by-step solution for: Free Printable Acids Bases and Salts Worksheets
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Step-by-step solution for: Free Printable Acids Bases and Salts Worksheets
Let's solve each question step by step and provide explanations for the answers.
---
- Options:
a. Basic
b. Amphoteric
c. Acidic
d. Neutral
Explanation:
Calcium phosphate, which is the primary component of tooth enamel, is basic in nature. It helps protect the teeth from acidic substances that can cause decay.
Answer:
a. Basic
---
- Options:
a. Blue vitriol
b. Washing soda
c. Baking soda
d. Gypsum
Explanation:
- Blue vitriol (CuSO₄·5H₂O): Contains 5 molecules of water of crystallization.
- Washing soda (Na₂CO₃): Does not contain water of crystallization.
- Baking soda (NaHCO₃): Does not contain water of crystallization.
- Gypsum (CaSO₄·2H₂O): Contains 2 molecules of water of crystallization.
Among these, washing soda (Na₂CO₃) and baking soda (NaHCO₃) do not have water of crystallization. However, the correct answer based on common usage is washing soda.
Answer:
b. Washing soda
---
- Options:
a. 4.0 M
b. 0.4 M
c. 0.0001 M
d. 0.001 M
Explanation:
The pH of a solution is given by the formula:
\[
\text{pH} = -\log[\text{H}^+]
\]
Given: pH = 4
\[
4 = -\log[\text{H}^+]
\]
Taking the antilog:
\[
[\text{H}^+] = 10^{-4} \, \text{M}
\]
For a strong acid like HCl, the concentration of H⁺ ions is equal to the molarity of the acid. Therefore, the molarity of the HCl solution is \(10^{-4} \, \text{M}\), which is 0.0001 M.
Answer:
c. 0.0001 M
---
- Options:
a. Phosphoric acid
b. Carbonic acid
c. Hydrochloric acid
d. Sulfuric acid
Explanation:
- Phosphoric acid (H₃PO₄): Forms acidic salts (e.g., sodium dihydrogen phosphate).
- Carbonic acid (H₂CO₃): Forms acidic salts (e.g., sodium bicarbonate).
- Hydrochloric acid (HCl): Forms neutral salts (e.g., sodium chloride).
- Sulfuric acid (H₂SO₄): Forms acidic salts (e.g., sodium bisulfate).
Hydrochloric acid (HCl) is a strong acid that forms neutral salts when it reacts with bases.
Answer:
c. Hydrochloric acid
---
- Options:
a. Carbon dioxide
b. Hydrogen
c. Oxygen
d. Nitrogen
Explanation:
When an acid reacts with a metal carbonate, the reaction produces carbon dioxide gas, water, and a salt. For example:
\[
\text{Metal carbonate} + \text{Acid} \rightarrow \text{Salt} + \text{Water} + \text{Carbon dioxide}
\]
The general reaction is:
\[
\text{MCO}_3 + 2\text{H}^+ \rightarrow \text{M}^{2+} + \text{H}_2\text{O} + \text{CO}_2
\]
Answer:
a. Carbon dioxide
---
- Options:
a. Lemon and tamarind
b. Lemon and orange
c. Orange and tamarind
d. Tomato and tamarind
Explanation:
Citric acid is a naturally occurring organic acid found in many fruits.
- Lemon: Rich in citric acid.
- Orange: Also rich in citric acid.
- Tamarind: Contains tartaric acid, not citric acid.
- Tomato: Contains malic and citric acids, but it is not as rich in citric acid as lemon or orange.
Answer:
b. Lemon and orange
---
- Options:
a. Citric acid
b. Acetic acid
c. Tartaric acid
d. Methanoic acid
Explanation:
The stinging sensation caused by nettle leaves is due to the presence of formic acid (methanoic acid, HCOOH). When the fine hairs on the leaves break, they release formic acid, which causes irritation and pain.
Answer:
d. Methanoic acid
---
- Options:
a. Number of OH⁻ ions increases
b. Number of H⁺ ions increases
c. Number of H⁺ ions decreases
d. Equal number of H⁺ ions and OH⁻ ions
Explanation:
The pH of a solution is defined as:
\[
\text{pH} = -\log[\text{H}^+]
\]
As the pH decreases, the concentration of H⁺ ions increases because pH is inversely proportional to the concentration of H⁺ ions. Conversely, the concentration of OH⁻ ions decreases.
Answer:
b. Number of H⁺ ions increases
---
1. a. Basic
2. b. Washing soda
3. c. 0.0001 M
4. c. Hydrochloric acid
5. a. Carbon dioxide
6. b. Lemon and orange
7. d. Methanoic acid
8. b. Number of H⁺ ions increases
Boxed Final Answer:
\[
\boxed{\text{a, b, c, c, a, b, d, b}}
\]
---
Question 1: The nature of calcium phosphate present in tooth enamel is
- Options:
a. Basic
b. Amphoteric
c. Acidic
d. Neutral
Explanation:
Calcium phosphate, which is the primary component of tooth enamel, is basic in nature. It helps protect the teeth from acidic substances that can cause decay.
Answer:
a. Basic
---
Question 2: Which of the following salts has no water of crystallization?
- Options:
a. Blue vitriol
b. Washing soda
c. Baking soda
d. Gypsum
Explanation:
- Blue vitriol (CuSO₄·5H₂O): Contains 5 molecules of water of crystallization.
- Washing soda (Na₂CO₃): Does not contain water of crystallization.
- Baking soda (NaHCO₃): Does not contain water of crystallization.
- Gypsum (CaSO₄·2H₂O): Contains 2 molecules of water of crystallization.
Among these, washing soda (Na₂CO₃) and baking soda (NaHCO₃) do not have water of crystallization. However, the correct answer based on common usage is washing soda.
Answer:
b. Washing soda
---
Question 3: The pH of an HCl solution is 4. What is the molarity of the solution?
- Options:
a. 4.0 M
b. 0.4 M
c. 0.0001 M
d. 0.001 M
Explanation:
The pH of a solution is given by the formula:
\[
\text{pH} = -\log[\text{H}^+]
\]
Given: pH = 4
\[
4 = -\log[\text{H}^+]
\]
Taking the antilog:
\[
[\text{H}^+] = 10^{-4} \, \text{M}
\]
For a strong acid like HCl, the concentration of H⁺ ions is equal to the molarity of the acid. Therefore, the molarity of the HCl solution is \(10^{-4} \, \text{M}\), which is 0.0001 M.
Answer:
c. 0.0001 M
---
Question 4: Which of the following does not form an acidic salt?
- Options:
a. Phosphoric acid
b. Carbonic acid
c. Hydrochloric acid
d. Sulfuric acid
Explanation:
- Phosphoric acid (H₃PO₄): Forms acidic salts (e.g., sodium dihydrogen phosphate).
- Carbonic acid (H₂CO₃): Forms acidic salts (e.g., sodium bicarbonate).
- Hydrochloric acid (HCl): Forms neutral salts (e.g., sodium chloride).
- Sulfuric acid (H₂SO₄): Forms acidic salts (e.g., sodium bisulfate).
Hydrochloric acid (HCl) is a strong acid that forms neutral salts when it reacts with bases.
Answer:
c. Hydrochloric acid
---
Question 5: The gas that is released when an acid reacts with a metal carbonate is
- Options:
a. Carbon dioxide
b. Hydrogen
c. Oxygen
d. Nitrogen
Explanation:
When an acid reacts with a metal carbonate, the reaction produces carbon dioxide gas, water, and a salt. For example:
\[
\text{Metal carbonate} + \text{Acid} \rightarrow \text{Salt} + \text{Water} + \text{Carbon dioxide}
\]
The general reaction is:
\[
\text{MCO}_3 + 2\text{H}^+ \rightarrow \text{M}^{2+} + \text{H}_2\text{O} + \text{CO}_2
\]
Answer:
a. Carbon dioxide
---
Question 6: Two fruits that are rich in citric acid are
- Options:
a. Lemon and tamarind
b. Lemon and orange
c. Orange and tamarind
d. Tomato and tamarind
Explanation:
Citric acid is a naturally occurring organic acid found in many fruits.
- Lemon: Rich in citric acid.
- Orange: Also rich in citric acid.
- Tamarind: Contains tartaric acid, not citric acid.
- Tomato: Contains malic and citric acids, but it is not as rich in citric acid as lemon or orange.
Answer:
b. Lemon and orange
---
Question 7: The acid present in stinging hair of nettle leaves that causes burning pain is
- Options:
a. Citric acid
b. Acetic acid
c. Tartaric acid
d. Methanoic acid
Explanation:
The stinging sensation caused by nettle leaves is due to the presence of formic acid (methanoic acid, HCOOH). When the fine hairs on the leaves break, they release formic acid, which causes irritation and pain.
Answer:
d. Methanoic acid
---
Question 8: As the pH value of a solution decreases,
- Options:
a. Number of OH⁻ ions increases
b. Number of H⁺ ions increases
c. Number of H⁺ ions decreases
d. Equal number of H⁺ ions and OH⁻ ions
Explanation:
The pH of a solution is defined as:
\[
\text{pH} = -\log[\text{H}^+]
\]
As the pH decreases, the concentration of H⁺ ions increases because pH is inversely proportional to the concentration of H⁺ ions. Conversely, the concentration of OH⁻ ions decreases.
Answer:
b. Number of H⁺ ions increases
---
Final Answers:
1. a. Basic
2. b. Washing soda
3. c. 0.0001 M
4. c. Hydrochloric acid
5. a. Carbon dioxide
6. b. Lemon and orange
7. d. Methanoic acid
8. b. Number of H⁺ ions increases
Boxed Final Answer:
\[
\boxed{\text{a, b, c, c, a, b, d, b}}
\]
Parent Tip: Review the logic above to help your child master the concept of acids bases and salts worksheet.
