Specify the names and colors of the precipitates formed on mixing the following

Question

Specify the names and colors of the precipitates formed on mixing the following solutions: a) Barium nitrate and sodium sulfite: ______________ b) Sodium thiosulfate and lead acetate: ___________ Choose the compounds that could be oxidized, (e.g. by KMnO_4, leading to its discoloration): a) NaHCO_3 b) NaNO_2 c) Na_2 SO_3 d) Na_2 SO_4 Which anion (radical) gives the following results? a) Anion A + dil. HCI rightarrow Gas evolved and a yellow ppt was formed. Anion A is: ____________ b) Anion B + dil. HCI rightarrow Brown gas evolved. Anion B is: __________ c) Anion C + dil. HCl rightarrow Effervescence of a gas. Anion C_(aq) + MgSO_4 rightarrow White ppt (on cold) Anion C is: ___________ d) Anion D + dil.HCl rightarrow Gas with a suffocating odor and a yellowish white ppt. Anion D is: ___________

Explanation / Answer

Question 1.

a)

Baium Nitrate = Ba(NO3)2

Sodium Sulfite = Na2SO3

clearly, Barium sulfite will precipitate, due to the precipitation rules

BaSO3(s)

BaSO3 is slightly white, ad toxic

b)

fo

Sodium thiosulfate --> Na2S2O3

LEad acetate --> PbCH3COO --> PbC2H3O2

there will be precipitaate:

Lead and thioslfate will form

lead thiosulfate forms, it is slightly yellow color

Question 2.

oxidation ---> can further increase Oxygen amount in sample

NaHCO3 --< Na2CO3 (H ges as H2O)

NaNO2 --< NaNO3 (furhter oxidation)

Na2SO3 --< Na2SO4

Na2sO4 --< Can't be oxidized

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