How Does Adding Water Change the Molarity of a Solution?

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SUMMARY

The discussion focuses on calculating the new molarity of a potassium nitrate solution after adding 227 mL of distilled water to an existing 0.5 M solution. To determine the new molarity, one must first calculate the total volume of the solution after the water is added. The molarity formula, Molarity = moles/liter, is essential for this calculation, requiring knowledge of the initial moles of potassium nitrate and the new total volume.

PREREQUISITES
  • Understanding of molarity and its formula (Molarity = moles/liter)
  • Basic knowledge of solution preparation and dilution concepts
  • Ability to perform volume conversions (mL to L)
  • Familiarity with potassium nitrate properties and its role in solutions
NEXT STEPS
  • Calculate the total volume after adding 227 mL of water to the potassium nitrate solution
  • Determine the number of moles of potassium nitrate in the original solution
  • Learn about dilution principles and their mathematical implications
  • Explore practical applications of molarity in laboratory settings
USEFUL FOR

Students studying chemistry, particularly those learning about solution concentrations and dilution effects, as well as educators seeking to explain these concepts effectively.

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Homework Statement


A student accidentally spills 227 mL of distilled water into a beaker containing 0.5 M potassium nitrate solution
A) What is the new molarity?

Homework Equations


Molarity = moles/liter

The Attempt at a Solution


I'm just REALLY confused, and I would appreciate ANY hints to start me off. I, seriously, have NO IDEA what to do.

thank you so much :)
 
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How many moles of potassium nitrate do you have?
How does the molarity change when the volume changes after the water is added (i.e. what is the new volume)?
 
You need to know the prior volume of pot nitr. solution in the beaker.
 

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