Which has the higher concentration of Cl- ion?

What is the concentration of each ion?

• Indicate the concentration of each ion present in the solution formed by mixing the following. (Assume that the volumes are additive.) (a) 20 mL of 0.100 M HCl and 10.0 mL of 0.420 M HCl H+ is __M Cl - is __M (b) 15.0 mL of 0.302 M Na2SO4 and 36.2 mL of 0.200 M KCl Na+ is __M K+ is __M SO42- is __M Cl - is __M (c) 3.50 g of NaCl in 43.9 mL of 0.386 M CaCl2 solution Na+ is __M Ca2+ is __M Cl - is __M This is worth more than ten Yahoo! Answer points. If you want more, I will create another question for the person with the correct answer so he/she can get 20 points. Just email me at [email protected]

• Answer:

  a) 0.02 * 0.1 = 0.002 moles 0.01*0.42 = 0.0042 moles Total = 0.0062moles Conc (both ions same) = (1000ml/30ml) * 0.0062 = 0.206 moles/L b) 0.015*0.302*2= 0.0091 moles (1000/51.2)*0.0091 = 0.177 moles/L (na) Since the number of so4 is half, so will be its conc 0.177 / 2 = 0.08 moles/L (so42-) 0.0362*0.2 = 0.00724 (1000/51.2) * 0.00724 = 0.141moles/L for BOTH K and Cl c) Moles of Na and Cl = 3.5 / (23.3+35.5) = 0.06 1000/43.9 * 0.386= 8.8 moles/L (Ca) 1000/43.9 * 0.06= 1.367 moles/L (Na) 0.06+0.386*2= 0.832 1000/43.9*0.832= 18.9moles/L (Cl)