Question G23

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Kimberly 1H
Posts: 63
Joined: Fri Sep 28, 2018 12:17 am
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Question G23

Postby Kimberly 1H » Tue Oct 02, 2018 10:21 pm

I'm not sure how to start solving this problem:

In medicine, it is sometimes necessary to prepare solutions with a specific concentration of a given ion. A lab technician has made up a 100.0-mL solution containing 0.50 g of NaCl and 0.30 g of KCl, as well as glucose and other sugars. What is the concentration of chloride ions in the solution?

I believe the chloride ions in NaCl and KCl will dissociate, but I'm not sure how to start finding the concentration.

Elisa Bass 4L
Posts: 61
Joined: Fri Sep 28, 2018 12:23 am

Re: Question G23

Postby Elisa Bass 4L » Tue Oct 02, 2018 10:25 pm

Find the moles of Cl- in each compound by using stochiometry and then add the two and divide by the total volume.

keyaluo4C
Posts: 54
Joined: Fri Sep 28, 2018 12:17 am

Re: Question G23

Postby keyaluo4C » Wed Oct 03, 2018 12:19 am

To expand, you would find the moles of Cl- by adding the moles of Cl from each of the compounds. To do this you would just divide the mass of each compound by the molar mass and you would not have to multiply by anything because there is only one in each.

LeannaPhan14BDis1D
Posts: 57
Joined: Fri Sep 28, 2018 12:16 am

Re: Question G23

Postby LeannaPhan14BDis1D » Wed Oct 03, 2018 10:32 pm

For most of the problems in the set, you need to just start by changing the mass to moles. In this problem add to get the total number of moles of ions after and then divide over the volume given. After that you will get the molarity. :)


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