pH 13 Buffer solution is prepared from a strong base sodium hydroxide and potassium chloride salt. However a buffer contain a weak base or weak acid with their salts. What is the purpose of the addition of KCl salt?
A alkaline solution can be react with carbon di oxide gass and the pH may be change. Can a KCl salt be used to stabilise all alkaline solution?
It is generally accepted that pH buffers consist on weak acid with its conjugate base, or on weak base with its conjugate acid. Note that KCl is a neutral salt. That because KCl is the salt of the neutralization of a strong acid with a strong base. The pH of a KCl aq. sol. can be adjusted by adding either NaOH aq. or HCl aq., but should not be considered stable. The mixed KCl and NaOH aq. sol. can not be properly called a pH buffer solution. KCl is often used to regulate and/or increase the ionic strength.
For a pure KCl aq. sol. we can predict pH ≈ 7; see my posts elsewhere at this forum: https://www.researchgate.net/post/Please_tell_me_more_details_why_pH_in_1_M_KCl_is_higher_than_pH_in_water
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