1) When 25.0 mL of a 4.14×10-4 M silver nitrate solution is combined with 25.0 m
ID: 1042468 • Letter: 1
Question
1) When 25.0 mL of a 4.14×10-4 M silver nitrate solution is combined with 25.0 mL of a 3.60×10-5 M potassium iodide solution does a precipitate form? (yes or no) For these conditions the Reaction Quotient, Q, is equal to .
2) When 25.0 mL of a 9.51×10-4 M aluminum bromide solution is combined with 18.0 mL of a 8.46×10-4 M potassium phosphate solution does a precipitate form? (yes or no) For these conditions the Reaction Quotient, Q, is equal to .
3) When 18.0 mL of a 5.76×10-4 M potassium sulfide solution is combined with 12.0 mL of a 7.72×10-4 M cobalt(II) fluoride solution does a precipitate form? (yes or no) For these conditions the Reaction Quotient, Q, is equal to .
Explanation / Answer
1)AgNO3 = 25.0 of 4.14x10^-4M
KI = 25.0ml of 3.60x10^-5M
Total volume= 25.0+25.0= 50.0ml
after mixing
[AgNO3] = 4.14x10^-4x25.0/50.0=2.07x10^-4M
[KI] = 3.60x10^-5x25.0/50.0=1.8x10^-5M
AgNO3 +KI----------- AgI + KNO3
AgI---------------- Ag+ + I-
Q= [Ag+][I-]
Q= 2.07x10^-4x1.8x10^-5
Q= 3.726x10^-9
Ksp of AgI = 8.52x10^-17
Q>Ksp
Yes. precipitate wil be formed.
2) AlBr3 = 25.0ml of 9.51x10^-4M
K3PO4 = 18.0ml of 8.46x10^-4M
total volume = 25.0+18.0= 43.0mL
after mixing
[AlBr3]= 9.51x10^-4x25.0/43.0 = 5.529x10^-4M
[K3PO4] = 8.46x10^-4x18.0/43.0 =3.54x10^-4M
AlBr3 + K3PO4--------- AlPO4 + 3 KBr
AlPO4--------------- Al+3 + PO4-3
Q= [Al+3][PO4-3]
Q= 5.529x10^-4x3.54x10^-4 = 19.57x10^-8
Q= 1.96x10^-7
Ksp of AlPO4=9,84x10^-21
Q>Ksp
yes. precipitate will be formed.
the third problem is also similar manner.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.