Define (i) an acid, (ii) a base - Leaving Cert Chemistry - Question 7 - 2022
Question 7
Define (i) an acid, (ii) a base.
(iii) Define pH.
A 0.03 M HCl solution with a pH value of 1.5 was diluted by adding deionised water until its concentration was 0.00... show full transcript
Worked Solution & Example Answer:Define (i) an acid, (ii) a base - Leaving Cert Chemistry - Question 7 - 2022
Step 1
Define (i) an acid
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Answer
An acid is a substance that gives hydrogen ions (H extsuperscript{+}) or hydronium ions (H extsubscript{3}O extsuperscript{+}) in aqueous solution. It can be considered as a proton donor.
Step 2
Define (ii) a base
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Answer
A base is a substance that gives hydroxide ions (OH extsuperscript{-}) in aqueous solution. It acts as a proton acceptor.
Step 3
Define (iii) pH
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Answer
pH is defined as:
pH = - ext{log} rac{[H^+]}{[H_2O]}
Where [H extsuperscript{+}] represents the concentration of hydrogen ions in solution.
Step 4
Calculate the pH of the 0.003 M HCl solution
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Answer
To find the pH, use the formula:
pH=−extlog[H+]
Since the concentration of HCl is 0.003 M, which fully dissociates, we have:
pH=−extlog(0.003)=2.5
Step 5
Write A
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Answer
A 0
Step 6
Write B
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Answer
OH
Step 7
Write C
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Answer
H extsuperscript{+}
Step 8
Write D
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Answer
1
Step 9
Write E
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10
Step 10
Write F
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Answer
increases
Step 11
Write G
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decreases
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