1. How many moles of BaCl2 are needed to make 50mL of a 0.14M solution of BaCk2?
ID: 1039303 • Letter: 1
Question
1. How many moles of BaCl2 are needed to make 50mL of a 0.14M solution of BaCk2? a) 2.80 mol b) 0.007 mol 0.104 mol d) 0.07 mol e) 7.0 mol 2. Determine which compound is a salt CH3COOH NH3 c) Lil d) H2SO3 e) None 3. Which pair of compounds will form a buffer in aqueous solution? a) HCI and NaC b) HN3 and NH3 c) NaNO3 and Ca(NO3)2 d) NH4Cl and NH3 e) Ba(OH)2 and NaOH 4. What is the correct name for HNO3? a) nitric acid b) nitrous acid c) hydronitric acid trioxygen monohydrogen nitride e) none of the above 5. a) Name the following compounds:Explanation / Answer
3) Which pair of compounds will form a buffer in aqueous solution.
Buffer solution is an aqueous solution consisiting of a weak acid and its conjugate base or vice-versa.
From the options given, option d is the right answer as NH4Cl is a weak acid and NH3 is it conjugate base.
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