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3 years ago

The concentration of hydroxide ions is greater than the concentration of hydronium ions for acidic solutions. true or false

Chemistry

1 answer:

nevsk [136]3 years ago

6 0

Answer: False

Explanation:

pH is defined as the negative logarithm of hydronium ion concentration present in the solution.

$pH=-log[H_3O^+]$

If the solution has low hydronium ion concentration than hydroxide ion concentration, the pH will be high and the solution will be basic. The pH range of basic solution is 7.1 to 14

If the solution has high hydronium ion concentration than hydroxide ion concentration, the pH will be low and the solution will be acidic. The pH range of acidic solution is 0 to 6.9.

The solution having pH equal to 7 is termed as neutral solution.

Thus the given statement is False.

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Sulfuric acid in water dissociates completely into H+ and HSO4− ions. The HSO4− ion dissociates to a limited extent into H+ and

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Answer:

0.0010m SO₄²⁻

Explanation:

The freezing point depression due the addition of a solute into a pure solvent follows the equation:

ΔT = Kf×m×i (1)

<em>Where ΔT are °C that freezing point decreases (273.15K - 272.47K = 0.68K = 0.68°C). Kf is the constant of freezing point depression (1.86°C/m), m is molality of the solution (0.1778m) and i is Van't Hoff factor.</em>

Van't Hoff factor could be understood as in how many one mole of the solute (sulfuric acid, H₂SO₄), is dissociated.

H₂SO₄ dissociates as follows:

H₂SO₄ → HSO₄⁻ + H⁺

HSO₄⁻ ⇄ SO₄²⁻ + H⁺

<em>Not all HSO₄⁻ dissociates.</em>

1 Mole of H₂SO₄ dissociates in 1 mole of H⁺+ 1 mole of HSO₄⁻ + X moles of SO₄²⁻= 2 + X

Replacing in (1):

0.68°C = 1.86°C/m×0.1778m×i

2.056 = i

Moles of SO₄²⁻ are 2.056 - 2 = 0.056moles SO₄²⁻.

If 1 mole has a concentration of 0.1778m, 0.056moles are:

0.056moles ₓ (0.1778m / 1mole) =

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3 years ago