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Jedrick Zablan 3L
Posts: 68
Joined: Sat Aug 17, 2019 12:17 am


Postby Jedrick Zablan 3L » Fri Oct 11, 2019 12:07 am

Hello I need help on G5. How would I approach the problem?

A student prepared a solution of sodium carbonate by adding 2.111 g of the solid to a 250.0-mL volumetric flask and adding water to the mark. Some of this solution was transferred to a buret. What volume of solution should the student transfer into a flask to obtain (a) 2.15 mmol Na1; (b) 4.98 mmol CO322; (c) 50.0 mg Na2CO3?

Anish Patel 4B
Posts: 59
Joined: Thu Jul 11, 2019 12:17 am

Re: G5

Postby Anish Patel 4B » Fri Oct 11, 2019 12:17 am

molarity=mol/volume of solution
So, you first can calculate the molarity of the sodium carbonate solution. With this, you can use the mole to mole ratio of the various compounds in each part and the molarity equation to calculate the desired amounts needed for the volumes.

Maya Gollamudi 1G
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am

Re: G5

Postby Maya Gollamudi 1G » Sat Oct 12, 2019 4:54 pm

You can use the given mass of the solid and the volume of the water added to calculate the molarity of the sodium carbonate solution, which is 0.07967 M. In sodium carbonate there is a 2:1 mole ratio of Na+ to Na2CO3. Then you can use the M1V1=M2V2 equation can be used to calculate the volumes of each solution needed.

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