SOLUTION: Tara needs a 40% solution of sodium chloride. She has 20 milliliters of a 35% solution. How many milliliters of a 50% solution should she add to obtain the needed 40% solution?

Question 1089856: Tara needs a 40% solution of sodium chloride. She has 20 milliliters of a 35% solution.
How many milliliters of a 50% solution should she add to obtain the needed 40% solution?
Answer by ikleyn(52906) (Show Source): You can put this solution on YOUR website!
.

Maximum solubility of NaCl in water at 25 �C is 357mg/mL. 
NaCl is unusual in that its solubility does not increase appreciably with temperature, 
since at 100 �C, the solubility is 384 mg/mL.1

The density of a saturated solution at 25 C is 1.202 g/mL.

https://www.sigmaaldrich.com/content/dam/sigma-aldrich/docs/Sigma-Aldrich/Product_Information_Sheet/s7653pis.pdf

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There is entire bunch of lessons covering various types of mixture problems
    - Mixture problems
    - More Mixture problems
    - Solving typical word problems on mixtures for solutions
    - Word problems on mixtures for antifreeze solutions
    - Word problems on mixtures for alloys
    - Typical word problems on mixtures from the archive
    - Advanced mixture problem for three alloys
    - OVERVIEW of lessons on word problems for mixtures
in this site.

Read them and become an expert in solution the mixture word problems.

Also, you have this free of charge online textbook in ALGEBRA-I in this site
    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this online textbook under the topic "Mixture problems

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