CHEM 1401 Fall 2017 Sections 4 and 907 Take-Home Assignment 2 Name This assignme
ID: 560568 • Letter: C
Question
CHEM 1401 Fall 2017 Sections 4 and 907 Take-Home Assignment 2 Name This assignment is due on Monday, Nov. 6th (Sect. 4) or Tuesday, Nov. 7th (Sect. 907). 1. Write the net ionic equation for the precipitation reaction given below. Include the states in your equation for full credit. (4) Ba(NO3)2(aq) + 2 KIO3(aq) Ba(IO3)2(s) 2 KNO3(aq) + net ionic equation: 2. Answer the following questions about a 0.0900 M CuCl 2H20 solution. (6) A. What mass (in g) of CuCl2 2H20 is present in 25.0 mL of this solution?Explanation / Answer
Q1
net ionic --> includes noly reactins species
note thatn only solid is formed, so it has
Ba2+ and IO3- ions
therefore, net ionic must contain those
Ba2+(aq) + 2IO3-(aq) --> Ba(IO3)2(s)
Q2.
1 liter of solution = 0.09 mol of CuCl2*2H2O
25 mL --> 25*10^-3 Liter --> x
x = (25*10^-3)/1*0.09
x = 0.00225 mol of CuCl2*2H2O
Mw of CuCl2*2H2O = 134.45 +2*18 = 170.45 g/mol
mass = mol*WM =0.00225*170.45 = 0.3835 g of CuCl2*2H2O