Question

UNIVERSITY OF THE WEST INDIES DEPARTMENT OF BIOLOGICAL AND CHEMICAL SCIENCES CHEM 0015s PRELIMINARY CHEMISTRY 1 ASSIGNMENT t he solubdity of caloum phosphate, Cas(PO4), is 7.7-10 0/dm at 25 "C. Calouate its solubility product at this temperalure. Give your answer in molidm 2 A buffer solution was made up of ammonia and water which produced ammonium ions and hydroxide ions. This solution initialy contained 1.00 M odf ammonia and 0.400 M of ammonium chloride. (K. 5.62 10 M) a Wnte the equilibrium equation which represents this buffer and the simplified K, expression b. Assuming that the ammonium ion is weakly acidic, behaves like an acid and will dissociates into its ions. Write the K, expression, calculate the initial prH and the pK, of this buffer solution Calculate the effect on the pH of adding () 5.00 cm of 10.0 M hydrochloric acid and (i) 5.00 cm of 10.0 M sodium hydroxide solution to 1000 cm of the buffer solution. 3. Reactants 8 and C were mixed to form product A. 0.500 mol of B and 0.300 of C were mixed in a container of volume 10.0 dm at a temperature of 400 K. A equilibrium there was found to be 0.100 mol of A present. a. Write the equilibrium equation which corresponds to this situation. b. Calculate K at this temperature. 4. 0.200 mol of dinitrogen tetroxide, NO4, was allowed to reach equilibrium at 25 °C according to the equation, N;Og 2 NO2 The equi 4.60 g of nitrogen dioxide and the equilibrium pressure was 0.431 arm. Find K, at rium mixture contained this temperature

Answer 1

I am trying to solve question 1 taking solubility 7.7×10^-4 gram/dm^3 because image is not proper.

/ DATE: / PAGE NO.: solution- The given values are - Solubility of calcium tphosphate (s) z 7.7x16 guanya - Temperatwa z 25C The reaction equation far equilibrium can be written as - CazCoop), (8) = 3.62+ + 2 porten of $ z Solubility of calcium phosphate then clearly [Ca2+] = 35 and [POQ?.] z 25 Now solubility, expocession can be written as AB S2 77xTozie Ksp z [cat]° [post1 molar mass of CapCroala z 3 10.18g/ml ksb z 10895 2 108x ( 2.48 xtorfamily S₂ 77x10 mole - 310-18 dan 108 x 9-38 XL0' X 10 30 Iz 2.98 x 100 male z 1013x10-26 males dms ames Unit ad omitted for ksp Hence Kep z [38] ² [as] kspz 1.013 X 2026