chemistry-help me answer these questions CHML 202-002, General chemist il labora
ID: 999076 • Letter: C
Question
chemistry-help me answer these questions
CHML 202-002, General chemist il laboratory Final Ex Spring 2016 Dr. Karan Name: 1) Answer true (T) or false (F) for the each of the following questions. (3 pts each 1 Conjugate base of HPO s HaPO Indicate T or F 22 Absorbance of light is related to concentration of a solution b The Beer Law Lambert Molar extinction coefficient is a constant value for any solutions 4 Cations of metals and larger alkaline earth metals such as Ca hydro e but most other metals do hydrolyze to produce acidic solutions 5 Polyprotic acids possess more than one ionizable proton Ba do not Wearing an eye goggles in a chemistry laboratory is optional 7 The vapor pressure of a liq directly proportional to its temperature uid solubility and osmotic pressure are colligative properties of The b.p m.p substances 9 Smaller the Pka values indicate greater the acidity 10 0.1M NaCl will hydrolyze but not 0.1M NH4Cl 2) Answer the following questions respect to the following cell, Ca(s)lca2" (aq) (1M) Mn2 (aq) (1M) Mn(s) a. Write a chemical equation for the reaction that occurs in the cell: (4pts) he standard cell potential (E%) of the above cell is 1.69V. Calculate the b. equilibrium constant (K) of the reaction. (4pts) 0.0592 logK Remember n kJ of the reaction. (4pts) c. Calculate the free ener where F 96485 JIV-mol e AG nFE K85Explanation / Answer
1) False ( conjucate base of HPO42- is PO43-)
2) True ( A = ECl, absorbance depends on concentration)
3) True ( A =ECl , E is a constant)
4) False ( alkali and alkaline earth metals will hydrolyse and they will form basic solutions)
5) True ( polyprotic acids will have more than one ionizable protons)
6) False ( wearing goggles is not an optional , it is must)
7) True ( PV = nRT, pressure directly proposional to temperature)
8) False ( colligative properties are the properties of the dilute solutions not for the substances)
9) True ( smaller the pKa or larger the Ka is more acedic)
10) False ( both are hydrolyze)
2) a) Ca(s) + Mn2+ (aq) ------> Ca2+ (aq) + Mn(s)
b) dGo = -nFEo
dGo = -RTlnK
lnK = 326119 J / 8.314 J/K*298K
log K = 57.16
K = 1.43*1057
C) dG = -2*96485*1.69
dG = -326.119 kJ/mol
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