Calculate the pCa for the titration of 100 ml of 0.050 M Ca²+ at pH = 8 with 0.1 M EDTA After addition of 60 ml EDTA? Lütfen birini seçin: a. 7.6 b. 14.2 c. 5.5 d. 9.9 e. 10.2
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- The potentiometric titration data of 2,422 mmol chloride ion with 0.1000 M AgNO3 are as follows. What should the x and y axis values be to find the turning point using the first derivative curve? AgNO3 volume (mL) Potential (Volts) 5.0 0.062 15.0 0.085 20.0 0.107 22.0 0.123 23.0 0.138 23.50 0.146 23.80 0.161 24.00 0.174 24.10 0.183 24.20 0.194 24.30 0.233100 mL of mineral water containing Mg2+ and Ca2+ is taken and titrated with 86.65 mL of 0.06120 M EDTA. NH4F was added to the second 100 mL portion taken from the mineral water to mask the magnesium in the sample as MgF2, and when this sample was titrated with the same EDTA solution, 38.56 mL was spent. Find the concentration of CaCO3 and MgCO3 in the sample in ppm.Calculate the pCa for the titration of 50 ml of 0.02 M Ca2+ at pH = 8 with 0.4 M EDTA after addition of 40 ml EDTA? Ca2+ + Y4- ⇄ CaY2- Kf = 5x1010 a. 9.6 b. 4.9 c. 7.7 d. 10.2 e. 7.6
- Consider the titration of 25.0mL 0.020M of Co(NO3)2 with .0100M EDTA in a solution buffered to pH 10.00. Calculate pCo^2+ at the following volumes of added EDTA. a. 0.0 mL b. 20.0 mL c. 40.0 mL d. 49.0 mL e. 50.0 mL f. 50.1 mL g. 55.0 mL h. 60.0 mLCalculate the pCa for the titration of 50 ml of 0.02 M Ca2+ at pH = 8 with 0.4 M EDTA at the equivalence point Ca2+ + Y4- ⇄ CaY2- Kf = 5x1010 Select one: a. 7 b. 12 c. 10 d. 5 e. 9A 35.0 mL of 1.00 x10–2 M Ca2+ was titrated with 0.0250 M EDTA at a pH of 10 and in the presence of 0.0500 M NH3. The formation constant for Ca2+–EDTA is 4.5 x1010. *αY4– = 0.35 at a pH 10; αCa2+ = 0.969 when the concentration of NH3 is 0.0500 M. Calculate the pCa (20pts) a.) Before equivalence point b.) At equivalence point c.) After equivalence point
- Titration of the I2 produced from 0.2645g of primary standard KIO3 required 45.36mL of sodium thiosulfate. Calculate the concentration of the Na2S2O3 in M. IO3- + 5I- + 6H+ --> 3I2 + 3H2O I2 + 2S2O32- --> 2I- + S4O62- KIO3 mw = 214.001g/molA commercial lab received a batch of industrial wastewater samples for analysis. Johnplans to test water hardness of these unknown samples. Prior to complexometric titration,the titrant, EDTA solution needs to be standardized. A 50.00 mL of 5.67 x10-3 M Ca2+standard solution required average of 38.10 mL of unknown EDTA solution to reach itsend point. Based on titration information recorded, work out the correct molarity of EDTAsolution.A solution containing 60 mL of a 0.025 mol / L metal ion (Mn +) buffer buffered to pH 7.0 was titrated with a 0.05 mol / L EDTA solution. Data: Conditional formation constant (Kf)=10^15. Determine: i) The concentration of the free metal when ½ of the equivalence volume is added. ii) the concentration of free metal in the equivalence volume. iii) the concentration of free metal with an excess of 2 mL of EDTA? (Data - EDTA constants: K1=0.01; K2=2.19.10^-3; K3=6.92.10^-7; K4=5.75.10^-11)
- Which of the following EDTA titration formats can be used when the analyte reacts too slowly with EDTA? Direct titration Back titration Displacement titration Indirect titration 1 only 2 only 2 & 3 3 only 4 onlyYou took 25.00 mL of unknown water solution and titrated it with EDTA. The EDTA solution molarity was 0.01 M, and it took 16.50 mL to reach the end point. With the blank it took only 0.98 mL to reach end point. 15.52 mL of EDTA solution were used to titrate hardness that actually came from the unknown 1.552×10−4 moles of EDTA reacted with hardness-causing ions from the unknown sample 1.552×10−4 moles of hardness-causing ions were present in the unknown sample A) Assuming that the total hardness of water is due to CaCO3, how many grams CaCO3 does it correspond to? B) What is the total hardness of the unknown water in ppm CaCO3?Titration of 50.00 mL of 0.04715 M Na2C2O4 required 39.25 mL of a potassium permanganate solution. 2MnO4- + 5C2O4-2 +16H+ -> 2Mn2+ + 10CO2(g) + 8H2O Calculate the molar concentration of the KMnO4 solution What molecules would interfere with the titrimetric analysis?