Lecture 11Addendum: Some Useful Information for Figuring Out Acid/Base CalculationssymbolH+HABH+BA-OH-typeStrong acidWeak acid IWeak acid II(salt of weak base)Weak base IWeak Base II(salt of weak acid)Strong baseexampleHNO3Acetic acidAmmoniumchlorideammoniaSodium acetatePotassiumhydroxideK rangeKa= Ka= 10-2to 10-10Ka= 10-2to 10-10Kb= 10-2to 10-10Kb= 10-2to 10-10Kb= equation[H+] = CH+[H+] = (KaCHA)1/2[H+] = (KaCBH+)1/2[OH-] = (KbCB)1/2[OH-] = (KaCA-)1/2[OH-] = COH-pH range0-23-63-68-118-1112-14pOH range12-148-118-113-63-60-2Useful thoughts in working acid-base problems:1. The first thing you do when you work an acid base problem is identify each compound as one of the 6 typesof acids or bases: H+, HA, BH+, A-, B, OH-.2, If the problem involves a single acid or base, work the simple strong or weak acid problem as above.3. Before you work a problem, estimate the pH of the answer. Note the simple relationship between K and pH.
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