Question

Part I: Vocabulary 1. (12 pts). True/false a. (L ) An advantage a flow injection analyzer is that it can be miniaturized. b. L ) This equation describes the reaction below: K= CN + H2O HCN + OH- c. ) An R2 value of 0.9 is considered perfect. d. G ) When titrating a strong acid with a strong base, a very small change in H2O* concentration happens at the equivalence point. e. b ) f. L ) When choosing which buffer to use, it's best to pick one with a pk, within 1.0 of your desired pH. 2. (8 pts) For the following reactions, identify the acid, base, conjugate acid, and conjugate base. a. H PO, + OH Acid: HPO 2 + H2O Base: Conjugate Acid: Conjugate Base:

analytical chemistry

Answer 1

Q1:

(a) True :

(b) False , the given equilibrium indicates the K​​​​​​b of CN​​​​​- .

(c) True , the value of R​​​​​​2 closer to 1 is considered good .

(d) False , because at equivalence point there is sharp change in the pH value so does the concentration of H3O+ .

(f) True , because buffer function effectively if

pH = pKa $\pm$ 1

Q2:

Acid = H2PO4-

Base = OH​​​​​-  

Conjugate acid = H2O

Conjugate base = HPO​​​​4​​​2-