alhinetetraacetate, Na, H,Y, Solution aH2, required to prepare 250 mL. of a 0,01

Question

alhinetetraacetate, Na, H,Y, Solution aH2, required to prepare 250 mL. of a 0,01 M Na,H,Y solution. See Part A.. Trial I Trial 2 Trial 3 1. Volume of standard Ca? solution (mL) 2. Concentration of standard Ca* solution (molUL) 3. Mol Ca2+ = mol Na,H2Y (mol) 25.0 25.0 25.0 .or 60 o.oomL tsengla10 5. Buret reading,final (mL) 410 335IO 38.7 6.Volume of Na,H2Y titrant (mL) ltv 86.78 480 7. Molar concentration of Na,HY solution (moUL) 8. Average molar concentration of Na,H,Y solution (mol/L) B. Analysis of Water Sample Trial I Trial 2 Trial 3 A00.0 abo 1. Sample volume (mL) S6,0 2,Buret reading, initial (mlrdi.3 - 3. Buret reading,final (mL) 1lo 41.30 40 L40 8.10 476-104 4, Volume of Na,H,Y tirant (mL) 8.10 10.20 Experiment 21 261

Explanation / Answer

3a. The color of the solution is wine red after addition of indicator.

Explaination -----> The pH range of EBT is in between 6.3 to 11.5. EBT will change its color to red in acidic media and orange in basic media. When you added EBT to hard water with pH of about 10, it form weak red complex with metal ions [Ca2+ and Mg2+].

b. When you added Na2H2Y solution, the colour changes to blue due Na2H2Y react and consume all the metal ions and releases free indicator.

4. Ofcourse, molarilty will change if you dont wash with distilled water. Somany number of particle might adhere to side,this definitely changes molarity of solution.

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