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Calculate the concentration of H3O+ in a solution that contains 5.5 × 10-5 M OH- at 25°C. Identify the solution as acidic, basic, or neutral.

a. 1.8 × 10-10 M, acidic
b. 9.2 × 10-1 M, basic
c. 5.5 × 10-10 M, neutral
d. 9.2 × 10-1 M, acidic
e. 1.8 × 10-10 M, basic

1 Answer

4 votes

Answer:

The correct answer is option (e).

Step-by-step explanation:

Concentration of hydroxide ions
[OH^-]= 5.5* 10^(-5) M

The pOH of the solution is defined as negative logarithm of hydroxide ions of in an aqueous solution.

  • Higher the value of pOH more will be the acidic solution.
  • Lower the value of pOH more will be the basic solution.
  • At value equal to 7 the solution is said to be neutral.


pOH=-\log[OH^-]


pOH=-\log[5.5* 10^(-5) M]=4.259

pH +pOH = 14

pH = 14-pOH

pH=14 - 4.259 = 9.741

The pH of the solution is defined as negative logarithm of hydronium ions of in an aqueous solution.

  • Higher the value of pH more will be the basic solution.
  • Lower the value of pH more will be the acidic solution.
  • At value equal to 7 the solution is said to be neutral.


pH=-\log[H_3O^+]


9.741=-\log[H_3O^+]


[H_3O^+]=1.8* 10^(-10) M

The solution is basic as pH of the solution is 9.741.

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