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3 years ago

Which of the following yields a basic solution when dissolved in water? I. Nh3 ii. Na2o iii. Lioh iv. P4o10

Chemistry

1 answer:

emmainna [20.7K]3 years ago

8 0

Answer: The correct answer is Option 1, Option 2 and Option 3.

Explanation:

A base is defined as the substance which releases hydroxide ion when dissolved in water.

For the given options:

Option 1: $NH_3$

When ammonia is dissolved in water, it produces ammonium hydroxide which forms a basic solution.

$NH_3+H_2O\rightarrow NH_4OH$

Option 2: $Na_2O$

When sodium oxide is dissolved in water, it produces ammonium hydroxide which forms a basic solution.

$Na_2O+H_2O\rightarrow 2NaOH$

Option 3: $LiOH$

When lithium hydroxide is dissolved in water, it produces aqueous lithium hydroxide which forms a basic solution.

$LiOH+H_2O\rightarrow LiOH(aq.)$

Option 4: $P_4O_{10}$

When phosphorus pentoxide is dissolved in water, it produces phosphoric acid which forms an acidic solution.

$P_4O_{10}+6H_2O\rightarrow 4H_3PO_4$

Hence, the correct answer is Option 1, Option 2 and Option 3.

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To calculate the number of moles for given molarity, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (in mL)}}$ .....(1)

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$pH=pK_a+\log(\frac{[\text{salt}]}{[acid]})$

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$pK_a$ = negative logarithm of acid dissociation constant of propanoic acid = 4.89

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pH = ?

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$pH=4.89+\log(\frac{(0.04514/0.26594)}{(0.09206/0.26594)})\\\\pH=4.58$

Hence, the pH of acid solution is 4.58

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