42 Based on Table G, what is the mass of KCl that must be dissolved in 200. grams of H2O at 10.°C to

NY Chemistry Regents Exam Jan 2023

42 Based on Table G, what is the mass of KCl that must be dissolved in 200. grams of H2O at 10.°C to make a saturated solution? (1) 15g

(2) 30. g

(3) 60.g

(4) 120. g

Solution: Note that table G shows solubility in 100 g of water and we are asked in 200 grams. Find 10.°C at the bottom and scroll up to the KCl line. It is about 30 grams. We must multiply by 2 since this is for 200 grams of water and the table is for 100grams. 30g*2 = 60g choice 3.