of 0.645 M KCl and 600 mL of 0.355 M MgCl_2? please help!!! cant seem to figure this out. Thnaks
they are lieing to you. it don,t cost that much for a brake job. squeaking brakes could be brake dust, hard pads or the rotors needs turning and all that stuff would,nt come to that much. besides that, you car has a warranty. take it back and they will fix them for free.
unless there is something majorly wrong, don't know what they told you, that estimate sounds huge. A car with that few miles should not be having brake problems. Definitely get a second opinion.
First, we assume that both KCl and MgCl2 are fully dissolved in the solution (both are highly soluble in water which make it a very valid assumption. Second, we determine the number of moles of Cl- we can obtain from each solution: 0.235 L (0.645 mol/L) 0.152 mol 0.600 L (0.355 mol/L) 0.213 mol Total number of Cl- 0.365 mol Third, because the volumes are additive, the total volume would be 0.835 L. Now, we have all the pieces. Concentration will be 0.365 mol/0.835 L 0.437 M of [Cl-]
