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- Calculate the pNi2+ at the equivalence point for the titration of a 20.00 mL solution of 0.0500 M NaOH with 0.045 M NiCl2 to precipitate Ni(OH)2 (Ksp = 6 x 10-16).A 50.0ml sample of water containing both Ca+2 and Mg+2 is titrated with 16.54ml of 0.01104M EDTA in an ammonia buffer of pH 10. Another 50.0ml sample is treated with NaOH to precipitate the Mg(OH)2 and then titrated at pH 13 with 9.26ml of the same EDTA solution. Calculate the ppm each of CaCO3 and MgCO3 in the sample.will H3N titrate with 1.0M Ba(OH)2?
- How will 100mM Tris-Cl buffer be prepared?In this experiment, the color change from pink/violet to colorless during the titration is caused by: change from MnO4– to Mn2+ change from Fe2+ to Fe3+ change from H+ to H2O the addition of an indicator.Average [EDTA] = C: Determination of the hardness of an unknown water sample: Using an unknown water sample, three 25 mL samples in 3 separate 250 mL Erlenmeyer flasks are prepared. To each flask, 5 mL of pH pH10 buffer, 3 to 5 drops of Eriochrome Black T indicator, and 15 drops of 0.03 M MgCl2 solution are added. Each flask is titrated to the end point using EDTA.
- 5. A 100-ml sample of water containing Ca²* and Mg2* ions is titrated with 15.28 mL of 0.01016 M EDTA in an ammonia buffer at pH 10.00. Another sample of 100 mL is treated with NaOH to precipitate Mg(OH)2, and then titrated at pH 10.00 with 10.43 ml of the same EDTA solution. Calculate the conc in ppm of CaCO: (100.09) and MgCO3 (84.314) in the sample.A 50.00 mL aliquot from a 1.50 L ferrous sulfate (FeSO4) stock solution is titrated with 20.00 mL potassium dichromate (K2Cr2O7) to reach the green-to-purple diphenylamine endpoint. If the concentration of K2Cr2O7 is 2.50 mM, calculate the FeSO4 concentration of the stock solution. Enclose in a box your final answer. Use correct significant figures. 6 FeSO4 + K2Cr2O7 +7 H2SO43 Fe2(SO4)3 + Cr2(SO4)3 + K2SO4 + 7 H₂OCompare Tris and PBS as buffers in terms of temperature, ionic strength, and solvent effects.
- Blank titration is carried out using AgNO3 and which sample solution? Distilled water NaCl or KCl solution Phosphate buffer Main water sampleConsider the titration of 50.0 mL of 0.170 M HA (K₂ = 4.2 x 105, pKa = 4.38) with 0.150 M NaOH. Determine the pH at the half-equivalence point 4.38 ○ 2.45 4.89 ○ 7.00 ○ 6.57A 25.00 mL mixture of 0.01000 M Fe(CN)64– and 0.01000 M Sn2+ is titrated with0.01000 M Ce4+. Write balanced equations for the two reactions involved