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- Is the Brita filter
effective in softening water (removing Ca2+, Mg2+)?
- Does the
softening capacity change over time?
- What is the
cation exchange chemistry? What are the resin cations?
Cation exchange
on the filter:
2(R-SO3-)(resin cation)+(s) + M2+(aq) -->
(R-SO3-)2M2+(s)
+ 2(resin cation)+ (aq)
- What Happened Last Time
- Measured hardness ([M2+]) of unfiltered
tap water using EDTA (Y4-) titration
- Filtered tap water and
tested samples
- pH analysis for H+
- Ion chromatography
analysis for Ca2+, Mg2+, Na+, K+
- What does
it mean if a cation concentration changes relative to its initial tap
water concentration?
- Today
- Graphical analysis
(Excel) of pH, IC data
- Construct graphs of
results to answer questions
- Refer to Writing
Your Report to be sure you answer all questions
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