Insoluble bases do not have hydroxide ions does it mean we cannot classify them in term of ph value?

Insoluble bases do not have hydroxide ions does it mean we cannot clas

1.	Insoluble bases do not have hydroxide ions does it mean we cannot classify them in term of ph value?
Answer» Insoluble bases generally are slightly soluble and will give some OH- ions. However, this does not give you any guide as to how much base is presentIn industry a slurry (mixture of solid and water) of lime Ca(OH)2 is used to neutralize waste acid. Lime is soluble to the extent of about 0.2%. Anything more than this is a solid plus the solution. The saturated solution has pH 12.4.Thus the pH of a lime slurry is the same for a 1%, 5%, or 10% suspension. The pH gives no indication, which is a practical issue in industry where it is used as a cheap but largely insoluble base.