need help on a hw ?

Question

Write a molecular equation for the precipitation reaction (if any) that occurs when the following solutions are mixed. If no reaction occurs, enter NR in each answer box. (Type your answer using the format CO2 for CO2. Do not leave any box blank. Use the lowest possible coefficients.)


(a) potassium bromide and calcium sulfide
___KBr(aq) + ___ CaS(aq) = ___ (s) + ___(aq)

(b) barium nitrate and lithium sulfate
___Ba(NO3)2(aq) +___ Li2SO4(aq) = ___(s) + ___ (aq)

(c) chromium(III) nitrate and potassium phosphate
___Cr(NO3)3(aq) + ___ K3PO4(aq) = ___(s) + ___(aq)

(d) aluminum sulfate and sodium hydroxide
___Al2(SO4)3(aq) + ___NaOH(aq) =___(s) + ___(aq)

Answer 1

(a)
__KBr(aq) + __ CaS(aq) = NR

(b)
_1_Ba(NO3)2(aq) +_1_ Li2SO4(aq) = _1_BaSO4(s) + _2_LiNO3 (aq)

(c)
_1_Cr(NO3)3(aq) + _1_ K3PO4(aq) = _1_CrPO4(s) + _3_KNO3(aq)

(d)
_1_Al2(SO4)3(aq) + _6_NaOH(aq) =_2_Al(OH)3(s) + _3_Na2SO4(aq)