Thursday

April 24, 2014

April 24, 2014

Posted by **marisa** on Friday, February 19, 2010 at 5:13pm.

- 11th grade -
**bobpursley**, Friday, February 19, 2010 at 5:37pmThe standard way is to figure the moles you need in the new volume, subtract the moles you have (volume*Molarity), then add the grams of solute to the solution, add solvent to the specified volume, stir, label, and store appropriately.

Here is my favorite way.

Example1. You have 20 ml of 5MHCl, and want 500ml of .20M HCl.

ok, you are diluting it 5/.2or 25 times. you have to add one part original solution, and 24 parts water.

25 parts into 500ml is each part is 20ml. So add 20 ml of the original solution (1 Part), and 24 parts (480ml) water. STir, label, store appropriately.

Example2.

You have 4M CuSO4(aq). YOu want 315ml of .56M solution.

Ok, you are diluting it 4/.56=7.143 times. You must add on part original, and 6.143 water.

315ml into 7.143 parts is 44.1ml per part. So add 44.1ml original solution, add six 6.143 parts water (6.143*44.1=270.9 ml)

check: 270.9+44.1=315ml

Practice makes perfect.

- 11th grade -
**chiquita**, Tuesday, February 23, 2010 at 2:14pmhaving a cabinet is a tradition begun by which president

**Related Questions**

Grade 11th Maths - (Second time posting this problem)This problem is related to ...

chemistry - Please help me with this dilution. Given a very concentrated tube of...

11th grade - The students of litchfield High school are in grades 9,10,11,12. Of...

Grade 11th Maths - (Second Time posting this problem)This problem is related to ...

Grade 11th Maths - (Second time posting this problem)This problem is related to ...

Grade 11th Maths - This problem is related to Chapter-Sets. Please solve the ...

dilution please help - How to use serial dilution to dilute a stock solution at ...

Grade 11th Maths - (Second Time posting this problem)This problem is related to ...

Grade 11th Maths - This problem is related to Chapter-Sets. Please solve the ...

Grade 11th Maths - This problem is related to Chapter-Sets. Please solve the ...