e352 K 352 7. In a voltaic electrochemical cell takes place at the a. oxidation,

Question

e352 K 352 7. In a voltaic electrochemical cell takes place at the a. oxidation, cathode b. oxidation, anode e. reduction, anode d. neutralization, cathode e precipitation, anode 8. A saturated solution of cobalt(I) fluoride, CoF2, is prepared by stirring solid cobalt fluoride in 100 ml of water until no further cobalt (II) fluoride, will dissolve. What action below will lead to a decrease in the calcium fluoride's solubility? Chi, th0 rnin yttr0001 Cott lit 101 Addition of HCl to the solution c c criniri b. Addition of NaCI to the solution c. Addition of Co(NO3)2 to the solution Co o d. Doubling the volume of the solution by addition of 100 ml of water e. Addition of KI to the solution, no cormon i 101 no com Which of the below acid-base conjugate pairs would be the best choice for preparing a buffer with pH-5.0 9. closesi ptt 40 5 a) Acetic acid (KA = 1.8x10-5) and sodium acetate Nitrous acid (KA 7.310) and sodium nitrite ala e. Hypochlorous acid (KA 2.9x10- and sodium hypochlorite d. Chlorous acid (KA1.1x10-2 and sodium chlorite e. Formic acid (Ka-1.8x1 ot) and sodium formate

Explanation / Answer

8. Co(NO3)2 addition decreases the solubility of the CoF due to common ion effects.

CoF2 <-----------> Co2+ + 2F- ( since CoF2 is weakly acidic)

Co(NO3)2 ------> Co2+ + 2NO3-

due to dissociation of Co(NO3)2 the common ion Co2+ concentration increase on the right side of the reaction, according to le chaterlier's principles equilibrium shifts to left hence formation of CoF is favoured hence its solubility decreases.

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