Course Chapters

Calculator Fundamentals

Mathematics Review

Basic Concepts

• Chemical Nomenclature
  
• Atomic Structure
  
• Stoichiometry
  
• Acid Base Chemistry
  

Pre-test

Post-test

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Linear Least Squares Regression

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Units Conversion Calculator

Nomenclature Calculator

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Stoichiometry Solution:

If only 0.25 molar NaOH and water are available, how much NaOH 
needs to be added to make 10 liters of 0.2 molar solution of NaOH? 

Answer= 8 liters.
One way to do the problem: If we have 10 liters of solution and we want a 0.2 liter solution it means that 2 out of the 10 liters have to be 1 molar NaOH. Since we only have 0.25 molar NaOH it means that the number liters needed will be four times greater than if we had 1 molar. Therefore we need 8 liters of NaOH.

Another way to solve this problem is to use the equation: