Science
Which of the following substances when dissolved in equal volume of water, will have the highest pH value?
options
- Sulphuric acid
- Acetic acid
- Magnesium hydroxide
- Sodium hydroxide
Acids Bases Salts
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Answer
Sodium hydroxide
Reason — The pH value of a solution indicates how acidic or basic it is :
- Acids have low pH values (< 7).
- Bases (alkalis) have high pH values (> 7).
Now,
- Sulphuric acid (H2SO4) is a strong acid, so it has a very low pH.
- Acetic acid (CH3COOH) is a weak acid, so its pH is slightly higher than that of sulphuric acid but still below 7.
- Magnesium hydroxide (Mg(OH)2) is a slightly soluble weak base, so it has a moderately high pH, but not the highest.
- Sodium hydroxide (NaOH) is a strong base, completely dissociates in water to produce a large amount of OH- ions, giving it the highest pH value (around 14).
Hence, when equal volumes of these substances are dissolved in water, sodium hydroxide will have the highest pH value.
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options
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options
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options
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