Jeffrey we are yet to get the answers.... Time is no longer on our side. Please
3ai)
On adding BaCl2 solution to a portion of saturated Na2Co3,white ppt is formed, Precipitate dissolves on adding excess dilute HCl.
3aii) Q is a reducing agent like SO2, H2S,CO
3bi)Calcium Oxide(CaO)
3bii)Concentrated H2SO4
3c)NaOH pellet is deliquescent because it absorbs moisture from the atmosphere to form solution.
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(2a)
Test: C + Water and filtered
Observation: part of C dissolves, colour less filtrate is formed
Inference: C is a mixture of a soluble salt
(2bi)
Test: 2cm^2 of filterate of salt C + AgNO3(aq) then dilute HNO3
Observation: white precipitate is formed
Inference: Cl^- present
(2bii)
Test: Solution im 2(b)(i) + excess NH3 solution
Observation: precipitate disorder in excess solution of NH3
Inference; Cl^- confirmed
(2ci)
Test: Resident + dilute HCl + shake
Observation; residue dissolved to form a blue solution
Inference; Cu^2+ present
(2cii)
Test; solution in 2(c)(i) + NH3 solution in drops and then in excess
Observation: light pale blue precipitate is formed precipitate dissolved in excess solution of NH3 to give a deep blue solution
Inference; Cu^2+ confirmed.