HClO is a weak acid (Ka = 4.0 × 10–8) and so the salt NaClO acts...

HClO is a weak acid (Ka = 4.0 × 10–8) and so the salt NaClO acts as a weak base. What is the pH of a solution that is 0.011 M in NaClO at 25 °C?

Solutions

Expert Solution

calculate Kb for ClO-
use:
Kb = Kw/Ka
Kw is dissociation constant of water whose value is 1.0*10^-14 at 25 oC
Kb = (1.0*10^-14)/Ka
Kb = (1.0*10^-14)/4*10^-8
Kb = 2.5*10^-7
ClO- dissociates as

ClO-        + H2O   ----->     HClO +   OH-
0.011                        0         0
0.011-x                      x         x

Kb = [HClO][OH-]/[ClO-]
Kb = x*x/(c-x)
Assuming x can be ignored as compared to c
So, above expression becomes

Kb = x*x/(c)
so, x = sqrt (Kb*c)
x = sqrt ((2.5*10^-7)*1.1*10^-2) = 5.244*10^-5

since c is much greater than x, our assumption is correct
so, x = 5.244*10^-5 M

use:
pOH = -log [OH-]
= -log (5.244*10^-5)
= 4.28

use:
PH = 14 - pOH
= 14 - 4.28
= 9.72
Answer: 9.72

queen_honey_blossom answered 1 year ago

Next > < Previous

Related Solutions

HClO is a weak acid (Ka = 4.0 × 10–8) and so the salt NaClO acts...

HClO is a weak acid (Ka = 4.0 × 10–8) and so the salt NaClO acts as a weak base. What is the pH of a solution that is 0.030 M in NaClO at 25 °C?

HClO is a weak acid (Ka = 4.0 × 10–8) and so the salt NaClO acts...

HClO is a weak acid (Ka = 4.0 × 10–8) and so the salt NaClO acts as a weak base. What is the pH of a solution that is 0.026 M in NaClO at 25 °C?

HClO is a weak acid (Ka = 4.0 × 10–8) and so the salt NaClO acts...

HClO is a weak acid (Ka = 4.0 × 10–8) and so the salt NaClO acts as a weak base. What is the pH of a solution that is 0.017 M in NaClO at 25 °C

HClO is a weak acid (Ka=4.0×10^−8) and so the salt NaClO acts as a weak base....

HClO is a weak acid (Ka=4.0×10^−8) and so the salt NaClO acts as a weak base. What is the pH of a solution that is 0.037 M in NaClO at 25 °C?

1.HClO is a weak acid ( ?a=4.0×10−8 ) and so the salt NaClO acts as a...

1.HClO is a weak acid ( ?a=4.0×10−8 ) and so the salt NaClO acts as a weak base. What is the pH of a solution that is 0.038 M in NaClO at 25 °C? 2.Determine the [OH−][OH−] , pH, and pOH of a solution with a [H+][H+] of 5.3×10−8 M5.3×10−8 M at 25 °C. 3.Determine the [H+][H+] , pH, and pOH of a solution with an [OH−][OH−] of 0.098 M0.098 M at 25 °C.

A.HClO is a weak acid (Ka = 4.0 × 10–8) and so the salt NaClO acts...

A.HClO is a weak acid (Ka = 4.0 × 10–8) and so the salt NaClO acts as a weak base. What is the pH of a solution that is 0.079 M in NaClO at 25 °C? ph= B.NH3 is a weak base (Kb = 1.8 × 10–5) and so the salt NH4Cl acts as a weak acid. What is the pH of a solution that is 0.014 M in NH4Cl at 25 °C? ph=

HClO is a weak acid (Ka = 4.0

Given the following information: hydrocyanic acid HCN Ka = 4.0×10-10 hypochlorous acid HClO Ka = 3.5×10-8...

Given the following information: hydrocyanic acid HCN Ka = 4.0×10-10 hypochlorous acid HClO Ka = 3.5×10-8 (1) Write the net ionic equation for the reaction that occurs when equal volumes of 0.292 Maqueous hydrocyanic acid and sodium hypochlorite are mixed. It is not necessary to include states such as (aq) or (s). (2) At equilibrium will the reactants or products be favored? (3) Will the pH of the resulting solution be less than seven, greater than seven or equal to...

Sodium hypochlorite (NaClO) is the active ingredient in household bleach. HClO has a Ka of 4.0...

Sodium hypochlorite (NaClO) is the active ingredient in household bleach. HClO has a Ka of 4.0 x 10-8 . You are titrating 30.0 mL of 0.10 M NaClO solution using 0.30 M HCl solution. 1) What is the pKa of HClO and the Kb of ClO- ? 2)What volume of the HCl solution (in mL) needs to be added to reach the equivalence point in this titration experiment? Show your work. 3)What volume of the HCl solution (in mL) needs...

CH3NH2 is a weak base (Kb = 5.0 × 10–4) and so the salt, CH3NH3NO3, acts...

CH3NH2 is a weak base (Kb = 5.0 × 10–4) and so the salt, CH3NH3NO3, acts as a weak acid. What is the pH of a solution that is 0.0490 M in CH3NH3NO3 at 25 °C?

Subjects