1)Which is a spectator ion involved in the reaction of K2CrO4(aq) and Ba(NO3)2(a
ID: 895991 • Letter: 1
Question
1)Which is a spectator ion involved in the reaction of K2CrO4(aq) and Ba(NO3)2(aq)?
2)Currently Severus Snape is only using water as a solvent and thus can use only water soluble compounds. Which of the following can't Severus use? That is, which one of the following is insoluble in water.
KCl,NH4NO3,NH4Br, BaSO4, NaC2H3O2
3)Which one of the following is soluble in water.
PbCl2, AgCl, PbI2, BaCO3, NH3
4) Which is the correct net ionic equation for the reaction of CaBr2(aq)+Na2SO4(aq).
5) Hermione needs sodium hydrogen sulfate and potassium permanganate for a potion. Which pair of ionic formulas is correct for these two compounds?
6) What is the correct net ionic equation when CaCl2 is mixed with AgNO3?
7)
Which represents the precipitation reaction when mixing sodium nitrate and lithium sulfate.
2NaNO3(aq)+Li2SO4(aq) 2LiNO3(s)+NaSO4(s)
No Precipitation, no reaction.
2NaNO3(aq)+Li2SO4(aq) 2LiNO3(s)+Na2SO4(s)
2NaNO3(aq)+Li2SO4(aq) 2LiNO3(s)+Na2SO4(aq)
2NaNO3(aq)+Li2SO4(aq) 2LiNO3(aq)+Na2SO4(s)
8)
Which is the correct molecular equation for the reaction of aqueous zinc II nitrate and aqueous sodium hydroxide. Note: a precipitate will form.
ZnNO3(aq)+2NaOH(aq) Zn(OH)2(s)+2NaNO3(aq)
Zn(NO3)2(aq)+2NaOH(aq) Zn(OH)2(s)+2NaNO3(aq)
Zn(NO3)2(aq)+2NaOH(aq) Zn(OH)2(aq)+2NaNO3(s)
ZnNO3(aq)+2NaOH(aq) Zn(OH)2(aq)+2NaNO3(s)
9)
What is the molecular equation for the reaction of solid calcium carbonate with aqueous acetic acid.
CaCO3(s)+2CH3COOH(aq) Ca(CH3COO)2(aq)+H2O(l)+CO2(g)
CaCO3(s)+CH3COOH(aq) CaCH3COO(aq)+H2O(l)+CO2(g)
CaCO3(s)+2CH3COOH(aq) Ca(CH3COO)2(s)+H2O(l)+CO2(g)
CaCO3(s)+CH3COOH(aq) CaCH3COO(s)+H2O(l)+CO2(g)
Explanation / Answer
1. K2CrO4 (aq)+ Ba(NO3)2 (aq)---- >2KNO3 (aq)+ BaCrO4(s)
2K+ CrO4- 2 + Ba+2 + 2NO3- ---> 2K+ + 2NO3- + BaCrO4
net ionic equation is
Ba+2 + CrO4-2 ---- > BaCrO4(s)
2. Except for BaSO4, rest of them are soluble in water.
3. NH3 is highly soluble in water, PbCl2 is soluble in hot water AgCl is insolble, PbI2 is sparinlgly soluble in cold water, but soluble in hortt water, BaCO3 is soluble
4. CaBr2(aq)+ Na2SO4(aq) ---> CaSO4(s) + 2 NaBr(aq)
Ca+2+ 2Br- + 2Na+ + 2SO4- ---> CaSO4 + 2Na+ 2Br-
Ca+2 + SO4- 2----. CaSO4
6. CaCl2+ 2AgNO3 ---> Ca(NO3)2 + 2AgCl
Ca+2 + 2Cl- + 2( Ag+ + NO3-) ---- Ca+2 + (2NO3-) + 2AgCl
2Ag+ 2Cl--- ...> 2AgCl
7. 2NaNO3(aq)+Li2SO4(aq) 2LiNO3(s)+Na2SO4(s)
8. 2NaOH(aq)+ Zn(NO3)2 (aq)--> 2NaNO3(aq)+ Zn(OH)2(s)
9. 2 CH3COOH(aq) + CaCO3(aq) = (CH3COO)2Ca(aq) + CO2(g) + H2O(l)
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