Complete the following word equations, and write balanced chemical equations in
ID: 484220 • Letter: C
Question
Complete the following word equations, and write balanced chemical equations in molecular, total ionic, and net ionic formats. Indicate which products are precipitates (downarrow) or gases (uparrow). If no net ionic reaction can be written, write NO RXN. Except for the first example, treat all reactions as straightforward double replacements. potassium chromate + hydrochloric acid rightarrow potassium chloride + water + potassium dichromate molecular 2 K_2CrO_4 (aq) + 2 HCl (aq) rightarrow 2 KCl (aq) + H_2O (l) + K_2Cr_2O_7 (aq) total ionic 4K^+ + 2CrO_4^2- + 2Cl^- rightarrow 2K^+ + 2Cl^- + H_2O + 2K^+ + Cr_2^O_7^2- net ionic 2CrO_4^2-(aq) + 2H^+(aq) rightarrow H_2O(l) + Cr_20O_7^2- (aq) Potassium dichromate is orange-red potassium chromate + silver nitrate rightarrow molecular total ionic net ionic potassium chromate + lead(II) nitrate rightarrow molecular total ionic net ionic potassium chromate + sodium carbonate rightarrow molecular total ionic net ionic potassium chromate + barium chloride rightarrow molecular total ionic net ionic silver nitrate + hydrochloric acid rightarrow molecular total ionic net ionic silver nitrate + lead(II) nitrate rightarrow molecular total ionic net ionicExplanation / Answer
Q.2
Potassium chromate + Silver nitrate -- >
We use solubility chart to answer this question.
Formula for potassium chromate
K2Cr2O4
Silver nitrate : AgNO3
When we look at solubility chart, we can see that chromate with silver are insoluble so Ag2Cr2O4 is the precipitate in this reaction.
Molecular reaction: ( balanced)
Potassium chromate + Silver nitrate -- > Silver chromate + potassium nitrate
K2Cr2O4(aq) + 2AgNO3 (aq) --- >Ag2CrO4(s) + 2KNO3(aq)
Total ionic equation:
We split the aqueous terms into ions and rest will be as it is.
2K+(aq) + Cr2O4^2-(aq) + 2Ag+(aq) +2NO3^- (aq) --- >Ag2CrO4(s) + 2K+(aq) + 2NO3-(aq)
Net ionic equation:
We cancel the spectator ions from both side.
Cr2O4^2-(aq) + 2Ag+(aq) --- >Ag2CrO4(s)
Q.3
Potassium chromate + lead (II) nitrate
We follow the same discussion as we had in question 2.
Potassium chromate + lead ( II) nitrate --- > lead ( II) chromate + potassium nitrate
Molecular equation:
K2CrO4 (aq) + Pb(NO3)2(aq) --- > PbCrO4(s) + 2 KNO3(aq)
Total ionic:
2K+(aq) + Cr2O4^2-(aq) + Pb2+(aq) +2NO3^- (aq) --- >PbCrO4(s) + 2K+(aq) +2 NO3-(aq)
Net ionic :
Cr2O4^2-(aq) + Pb2+(aq) --- >PbCrO4(s)
Q.4
Potassium chromate + Sodium Carbonate --- > No reaction
Reaction is not possible as both ions are soluble with potassium and sodium.
Q. 5
Potassium chromate + Barium chloride --- > Barium chromate + potassium chloride
Molecular equation:
K2CrO4 (aq) + BaCl2(aq) --- > BaCrO4(s) + 2 KCl(aq)
Total ionic:
2K+(aq) + Cr2O4^2-(aq) + Ba2+(aq) +2Cl^- (aq) --- >BaCrO4(s) + 2K+(aq) +2Cl-(aq)
Net ionic :
Cr2O4^2-(aq) + Ba2+(aq) --- >BaCrO4(s)
Q. 6
Potassium chromate + Hydrochloric acid --- > Chromic acid + Chloride.
Molecular equation:
K2CrO4 (aq) + 2HCl(aq) --- > H2CrO4(aq) + 2 KCl(aq)
Total ionic:
2K+(aq) + Cr2O4^2-(aq) + 2H+(aq) +2Cl^- (aq) --- > H2CrO4(aq) + 2K+(aq) +2 Cl-(aq)
Net ionic:
Cr2O4^2-(aq) + 2H+(aq) --- >H2CrO4(aq)