NAME (print): DATE: Lab 1: Pre-Lab Quiz: Basic operations (5 points; 10 min) Use
ID: 717107 • Letter: N
Question
NAME (print): DATE: Lab 1: Pre-Lab Quiz: Basic operations (5 points; 10 min) Use the word bank to answer Qs1-3 you can enter the letter corresponding to your answer 1. 2. 3. When Sodium Benzoate is dissolved in water and When the pH of a solution is When a salt of a weak acid is dissolved in water, it ionizes into cations a hydrolysis reaction occurs (1 pt) sodium benzoate is converted to -a p) _anions and A. Hydrochloric acid E. Sodium Benzoate B.hydroxyl E.h . 3 or Higher F. 3 or lower D.hydrogen G. Benzoic Acid ydrogen 4. a) 3 ml of a liquid A weighs 9 gm, calculate its density. Show all your calculations (1 point) 4b) What will be the mass of 13 mls of liquid A. Show all your calculations (I point)Explanation / Answer
1) Sodium benzoate in presence of hydrochloric acid forms benzoic acid. So A) Hydrochloric acid is correct.
2) If pH of the solution becomes F) Lower sodium benzoate is converted into G)Benzoic acid
3) When a salt of weak acid dissolved in water it ionizes into B) Hydroxyl anions and E) Hydrogen cations.
4)a. Density = Mass in g / Volume in mL
= 9 g / 3 mL
= 3 g/mL
4)B. Massof liquid A = Volume x Density
= 13 mL x 3 g/mL
= 39 g
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