1. The ionic solid (NH 4 ) 2 SO 4 is a strong electrolyte and dissolves 100%...
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Question:
1. The ionic solid (NH4)2SO4is a strong electrolyte and dissolves 100% in aqueous solution. If 52.9 g solid (NH4)2SO4dissolves into 100 mL water, please answer the following three question:
(1) Write the balanced equation for ion dissociation.
(2) How many moles of SO42-ions are present in the solution?
(3) What is the molarity of NH4+?
2. A 0.0250 M solution of Mn(NO3)2is reacted with 0.268 g PbO2. The balanced equation is
2Mn(NO3)2 (aq)+5PbO2 (s)+ 6 HNO3 5 Pb(NO3)2+ 2 HMNO4+ 2 H2O
How many liters (L) of the Mn(NO3)2solution is needed to use up all of the PbO2?
(Notes: Molarity (M) = mol/L; PbO2= 239.2 g/mol)
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