Answer the Q\'s un sheet of paper bearing your name and date, 1. What is the mas
ID: 969074 • Letter: A
Question
Answer the Q's un sheet of paper bearing your name and date, 1. What is the mass/volume % of a solution made by dissolving 15.0 g of CaCH in exactly 65.0 ml. of water? 2. What is the mass/mass % of a solution made by dissolving 8.0 g of dextrose in 50.0 g of water? 3. What is the molarity of a solution obtained by dissolving 7.350 g of KNO in some water and diluting to exactly 100.0 ml. in a graduated flask, and; 3. How many grams ofNajCOj arc there in exactly 10.00 ml. of a 0 1053 M solution of the salt? 4. What is the molarity of a solution made by diluting exactly 25.00 mL of a 0.2026 M solution of Nal to exactly 250 ml. in a graduated flask?Explanation / Answer
(1) m/v % = (1.5/65 )*100 = 2.3 %
(2) m/m % of dextrose = 8 x 100 / 58 = 13.8 %
(3) MOlarity = 7.35 X 1000 / (101 x 100 ) = 0.73 M
(4) Mass = 0.1053 x 106 x 10 /1000 = 0.112 g.
(5) 25 x 0.2026 = M2 x 250
M2 = 0.02026 M