Acid-Base Neutralization. Some basics and behavior of salts. Acid- Base Neutralization Double Displacement Reactions. acid + base salt + water. KNO 3 + H 2 O. HNO 3 + KOH. HF + NaOH. NaF + H 2 O. 2. HCl + Ca(OH) 2. CaCl 2 + H 2 O. 2.By mare
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Strong Acid-Weak Base and Weak Acid - Strong Base. CH 3 COOH(aq) + OH - (aq) -> CH 3 COO - (aq) + H 2 O(l). Slow change in pH before equivalence point; solution is a buffer CH 3 COOH(aq)/CH 3 COO - (aq) At halfway point [HA] = [A - ] pH = pK a
Example Problem: Weak Base. Calculate the pH of a 0.005M solution of Ammonia. 0.005 M ------- 0 M 0 M . I C E. -x ------- +x +x . 0.005-x ------- +x +x . K b =1.8x10 -5 =. Assumption check:.
Weak Base Equilibrium (continued). HA H + + A -. HCN H + + CN -. Every weak acid has a corresponding weak conjugate base. eg:. Here, HA is a weak acid, and A - must be a weak base. (it also happens to be the conjugate base of HA).
pH = -log [H + ] . Strong Acid . Strong base . Weak Acid. Weak Base. “ Conjugate Acid – Base Pair ” a proton donor & its corresponding proton acceptor . Stronger acid lower pH. Stronger Base higher pH.
pH curve for CH 3 COOH titrated with NaOH. pH at equiv. pt. 7. pH. B. mL of NaOH added. A. Weak Acid – Strong Base Titrations. The equivalence point is when, say, 50.0 mL of 0.10 M NaOH have been added to 50.0 mL of 0.10 M CH 3 COOH, but pH is > 7 at that point because.
Weak Acid + Strong Base Titration. There are two key points in a titration process. Equivalence Point – the point in the titration when the moles of added base (OH - ) are equal to the moles of acid in the original sample. Equimolar acid and base species.
Strong base neutralizes weak acid. Strong acid neutralizes weak base. How do we calculate the pH of a buffer ? 2 ingredient problem 0.10 M CH 3 COOH + 0.20 M CH 3 COO - pH = 5.05. NaA ( s ) Na + ( aq ) + A - ( aq ). HA ( aq ) H + ( aq ) + A - ( aq ). K a [HA].
Weak acid and base calculations. What’s so hard?. Unlike strong acids and bases, weak examples do not dissociate fully. For example, a 1 molL -1 HCl solution dissociates fully, so we make the approximation that the [H 3 O + ] = 1 molL -1.
Previously in Chem104: more acid/base reactions: weak / weak strong / strong strong / weak calculations Polyprotic acids. Today in Chem104: Titrations Buffers calculations. Titrations: a summary. 1) strong acid + strong base titrations. Have pH 7 at equivalence pt