Question

Examine the ph scale below. How does household bleach compare to household ammonia?

Answer 1

Household bleach compare to household ammonia = D) Household ammonia has 10 times higher H + concentration.

Further explanation

pH is the acidity level of a solution that depends on the concentration of the H⁺ ion. The greater the value the more acidic the solution and the smaller the pH.

pH = - log [H⁺]

So that the two quantities between pH and [H⁺] are inversely related because they are associated with negative values.

A solution with a different value of n has a difference of H ion ion concentration of 10ⁿ.

See the attached picture

We can see the pH value of each solution:

Ammonia household pH = 11.5

Household bleach pH = 12.5

From the choices of answers we complete as follows:

A) Household bleach is more acidic than ammonia household.

B) Household bleach has 10 times higher H + concentration than household ammonia.

 C) Household bleach has 100 times higher H + concentration than household ammonia.

 D) Household ammonia has 10 times higher H + concentration.

 E) Household ammonia has 100 times higher H + concentration.

 

Then both of them have H⁺ ion concentrations of

Ammonia household pH = 11.5

11.5 = - log H⁺

H⁺ = ${\displaystyle 10^{-11.5}$

Household bleach pH = 12.5

12.5 = - log H⁺

H⁺ =  ${\displaystyle 10^{-12.5}$

The difference in concentration:

${\displaystyle {\frac{10^{-11.5}}{10^{-12.5}}=10$

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Keywords: household ammonia, household bleach, pH

Answer 2

Answer is: household ammonia has 10 times higher H⁺ concentration.

1) pH(household ammonia) = 11.5.

pH = -log[H⁺], approximately the negative of the base 10 logarithm of the molar concentration of hydrogen ions.

[H⁺] = 10∧(-pH).

[H⁺] = 10∧(-11.5).

[H⁺] = 3.16·10⁻¹² M; concentration of hydrogen ions.

2) pH(household bleach) = 12.5.

[H⁺] = 10∧(-12.5).

[H⁺] = 3.16·10⁻¹³ M.

3) 3.16·10⁻¹² M / 3.16·10⁻¹³ M = 10.