A scientist determines how hard the tap water is in the laboratory, using an EDTA titration. If the pipes in the building are old and some rust dissolves into the tap water. how will the results of the test change?
A. The results will not change because the EDTA titra- tion only works with Ca2+ and Mg2+.
B. The titration will not be able to be carried out be- cause the tap water will be colored.
C. The tap water will appear to have less Ca2+ and Mg2+ present.
D. The tap water will appear to have more Ca2+ and Mg2+ present.
* For this answer, would the answer be D since the rust could contain other cations such as iron for the EDTA to attach to?
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