Consider the following pairs of liquids. Which numbered response contains all the pairs that are miscible and non that are immiscible? I. Benzene (C6H6) and hexane (C6H14) II. Water (H2O) and methanol (CH3OH) III. Water (H2O) and hexane (C6H14)
Read DetailsConsider the titrations of the pairs of aqueous acids and bases listed at the left. Which pair is incorrectly described (at the right) in terms of the acidic, basic or neutral character of the solutions ar the equivalence point? Acid-Base Pair Character at Equivalence Point (A) HClO + NaOH acidic (B) HNO 3 + Ca(OH) 2 neutral (C) CH 3COOH + KOH basic (D) HCl + NH 3 acidic (E) CH 3COOH + NH 3 neutral Hint: The conjugate base of a weak acid will hydrolyze water, similarly a conjugate acid of a weak base will hydrolyze water Example: HF + NaOH → H2O + F- + Na+; The F- is the conjugate base of the weak acid HF. The F- can react with water (hydrolysis) as shown below to produce OH- to make the equilibrium basic. F- + H2O → HF + OH-
Read DetailsUse the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 25 OC. (The equation is balanced.) Pb(s) + Br2 (l) à Pb2+ (aq) + 2 Br- (aq) Pb2+ (aq) + 2 e- à Pb (s) EO = -0.13 V Br2 (l) + 2 e- à2 Br- (aq) EO = +1.07 V
Read Details