A 20.8 mL of EDTA solution ( 2.0M) was used in a titration to determine the hardness of the water. If 25.0 mL was used for this experiment calculate the hardness of water. (Molar mass of CaCO3 = 100.09 g) 10 ppm 20 ppm 12300 ppm 166549 ppm E) 256789 ppm
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- 2A student used a pipette to add 25 cm³ of sodium hydroxide of unknown concentration to a conical flask. The student carried out a titration to find out the volume of 0.1 mol/dm3 sulfuric acid needed to neutralise the sodium hydroxide. The following is the table of results obtained. Titration Volume of sulfuric acid used/cm³ 1 27.85 27.30 27.25 27.10 27.30 a. Write down a balanced equation for the reaction between sodium hydroxide and sulfuric acid. b. Describe the titration experimental procedure (details of washings are expected) c. Determine the average titre value and explain your choice of titre values in calculating the average. d. Determine the concentration of sodium hydroxide. e. If instead of sulfuric acid, hydrochloric acid of the same concentration was used what would you expect the average titre value to be and why?Part A: Standardization of a Sodium Hydroxide Solution Titration 1 Titration 2 Titration 3 Mass of 125 mL flask 45.849g 46.715g 44.953g Mass of flask and KHP 46.849g 47.745g 46.003g Initial buret reading (mL) 0.5 ml 0.5 ml 0.5 ml Final buret reading (mL) 27.8 ml 26.5 ml 26.7 ml Volume of NaOH used (mL) 45.11 ml 45.06 ml 45.14 ml Calculations Titration 1 Titration 2 Titration 3 Moles of KHP Moles of NaOH Molarity of NaOH Average Molarity of NaOH: _______________Answer if true or false , if false, put the correct answer 1. There is 11.34 mmol in 0.2011 of 0.5604 M HgCl2 2. The x axis of sigmoidal titration curve is p function of the analyte or titrant 3.The concentration of the secondary standard is relative to a primary standard 4. There is 110 mmol in 79.8 mL of 0.1379 M NH4VO3 (116.98 g/mol)
- Direct titration: 10.90 ± 0.02 mL of an unknown KHP solution required 11.72 ± 0.02 mL of 0.1090 ± 0.0006 M NaOH to reach the end point. What is the concentration of KHP in the unknown solution reported with absolute uncertainty? If the unknown solution was prepared by dissolving 5.128 g of the unknown KHP (204.22 g/mol) in 100.00 mL of water, what is the weight percent of KHP in the sample?A 0.5264-g sample containing KBr is dissolved in 50 mL distilled water. Titrating with 0.04738 M AgNO3 requires 24.57 mL to reach the Mohr endpoint. A blank titration requires 0.75 mL to reach the same endpoint. Report the % (w/w) KBr (MM = 119.0) in the sample. 51.02 % 26.19% 12.76 % 25.51 %Would an indicator that has a Ka of 1.92x10-11 be suitable for a titration with an end point of 8.31? Maybe No Yes Not enough data
- Chemistry A 1.899 g of an oat cereal is determined by Kjeldahl analysis. The sample is digested with H2SO4, the resulting solution made basic with NaOH, and the NH3 distilled into 45.00 mL of 0.4325 M HCl. The excess HCl is back titrated with 27.00 mL of 0.670 M NaOH using mixed indicator. What is the %w/w protein in the sample if the protein grains averages 12.90% w/w N?If you titrate 50 mL of a sample with 0.06 N EDTA and the titration takes 12.4 mL of EDTA to reach the endpoint, what is the hardness of the sample in ppm as CaCO3?Identify the nature of the water sample from the hardness value.PClassID=1471954077 Petra titrates 50.0 mL of an orange juice sample with 65.0 mL of 0.20 M LİOH to reach the final endpoint in the titration. What is the concentration of the citric acid in the orange juice sample? H3C6H5O7 + 3LIOH → LI3C6H5O7 + 3H2O [?]M H3C6H5O7 [H,C,H,O,] (M) Enter
- 5. A 300.0 mg sample containing Na,CO3, NaHCO3 and NaOH and inert material either alone or in some combination was dissolved and titrated with 0.1000 M HCI the titration required 24.41 mL to reach the phenolphthalein endpoint. And an additional 8.67 mL to reach the methyl red endpoint. Determine the composition of the sample and calculate the percent of each titrated component.5. A 300.0 mg sample containing Na,CO3, NaHCO, and NaOH and inert material either alone or in some combination was dissolved and titrated with 0.1000 M HCI the titration required 24.41 ml to reach the phenolphthalein endpoint. And an additional 8.67 mL to reach the methyl red endpoint. Determine the composition of the sample and calculate the percent of each titrated component.A titration was performed to find the concentration of hydrochloric acid and the following results were obtained Trial Molarity 1 1.25 ± 0.01 2 1.24 ± 0.01 3 1.26 ± 0.01 The actual concentration of HCl was determined to be 1.000 M; the results of the titration are: Group of answer choices accurate and precise accurate but not precise inaccurate but precise inaccurate and imprecise