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Answers 6) Solution of unknown salts are treated with dilute HBr, H2SO4 and NaOH. A precipitate forms in all three. Which cation, K+;Pb2+ or Ba2+ could be present? • • • Potassium ions are highly electropositive, creating strong ionic compounds with these anions, all soluble. Barium ions are less electropositive than potassium but still forms strong ionic compounds soluble in water. Lead ions are not that electropositive and its huge size compared to the other cations would form weak ionic compounds, not soluble in water Cations Pb2+ are present in solution. 7) a) Stock solution 14.8 M NH3. How many mL of this solution to make 1000 mL 0.250M NH3. 𝐶1 × 𝑉1 = 𝐶2 × 𝑉2 1000 𝑚𝐿 × 0.250 𝑀 𝑁𝐻3 = 𝑉2 14.8 𝑀𝑁𝐻3 𝐶1 × 𝑉1 = 𝑉2 𝐶2 𝑽𝟐 = 𝟏𝟔. 𝟗 𝒎𝑳 b) 10 mL of stock solution diluted to 0.500 L, what’s the new concentration? 𝐶1 × 𝑉1 = 𝐶2 × 𝑉2 10 𝑚𝐿 × 14.8 𝑀 𝑁𝐻3 = 𝑉2 500 𝑚𝐿 𝐶1 × 𝑉1 = 𝐶2 𝑉2 𝑽𝟐 = 𝟎. 𝟐𝟗𝟔 𝑴 8) Density=1.2656 g/mL; 50.000 mL glycerol solution diluted to 250 mL. Molarity of new solution? 50 𝑚𝐿 𝑔𝑙𝑦𝑐𝑒𝑟𝑜 ...
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