Lab7 - How much Mg is in this unknown Name Jacqueline...

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Chemistry: An Atoms First Approach
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Chapter 14 / Exercise 13
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How much Mg is in this unknown? Name : Jacqueline Galeana (1) Prelab Questions: 1. Do EDTA solutions need to be standardized? Explain your answer. (4) No, in order for us to obtain our results, the EDTA does not need to be standardized with the metal that it will be chelating with because we are treating it as a primary standard. 2. Why is pH 10 used as the pH for the analysis of Mg? (4) We use pH 10 because we want to get the basic form of 4 ¿ Y ¿ so anything above pH 10 4 ¿ Y ¿ is predominant so it will react with the Mg ion present in the titration solution. 3. Why does it mean when an indicator is blocked? (4) If the Mg metal does not freely dissociate from the indicator, the metal Mg is said to block the indicator. [Dan15] 4. Does Mg block Eriochrome Black T? (1) No, Eriochrome Black T is not blocked by Mg. In the textbook, we see Eriochrome black T is blocked by 3 + ¿ 3 + ¿ Fe ¿ 2 + ¿ Cr ¿ 2 + ¿ Co ¿ 2 + ¿¿ ¿ Cu ¿ ..etc. [Dan15] 5. What is the formula weight for MgO? (2)
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Chemistry: An Atoms First Approach
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Chapter 14 / Exercise 13
Chemistry: An Atoms First Approach
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