A student is given unknowns to identify. Options: HCl NaOH NH4OH BaCl2 K2CrO4 Ag
ID: 1002833 • Letter: A
Question
A student is given unknowns to identify.
Options: HCl NaOH NH4OH BaCl2 K2CrO4 AgNO3 NiSO4
(A) The unknown is colorless, odorless, and neutral. It produces no precipates when reacted with any of the three halides, Cl-, Br-, and I-. It produces a yellow precipate when added to sodium chromate. Which of the options could it be? Write it's exchange reaction with the sodium chromate. Specify the states.
(B) The unknown is colorless, odorless, and neutral. When mixed with NaOH it produced a brown precipitate and when mixed with BaCl2 it produced a white precipate. Reactions with other halides gave yellow precipitates. What unknown is it? Write the exchange reaction with the unknown and NaOH. Write the balanced reaction between the unknown and BaCl2. Specify the states in all reactions.
Explanation / Answer
HCl: Acidic
NaOH: Basic
NH4OH : smell of NH3
BaCl2
BaCl2 + Na2CrO4 => BaCrO4 + 2NaCl
Ba2+ (aq)+ CrO42- (aq)=> BaCrO4 (s)
K2CrO4: Its yellow in color
AgNO3
NiSO4 has a deep green color.
(A) The unknown is colorless, odorless, and neutral. It produces no precipates when reacted with any of the three halides, Cl-, Br-, and I-. It produces a yellow precipate when added to sodium chromate. Which of the options could it be? Write it's exchange reaction with the sodium chromate. Specify the states.
BaCl2
BaCl2 + Na2CrO4 => BaCrO4 + 2NaCl
Ba2+ (aq)+ CrO42- (aq)=> BaCrO4 (s)
BaCl2 produce does not precipates when reacted with any of the three halides, Cl-, Br-, and I- because Both species; BaCl2 and hailide are soluble in water.
(B) The unknown is colorless, odorless, and neutral. When mixed with NaOH it produced a brown precipitate and when mixed with BaCl2 it produced a white precipate. Reactions with other halides gave yellow precipitates. What unknown is it? Write the exchange reaction with the unknown and NaOH. Write the balanced reaction between the unknown and BaCl2. Specify the states in all reactions.
AgNO3(aq) + NaOH(aq) = AgOH(s) + NaNO3(aq)
Brown
AgOH + BaCl2 = AgCl + Ba(OH)2
White
AlOH(aq) + BaCl2(aq) =AlCl2(s) + Ba(OH)2(aq)
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