use titration data to determine borate ion concentration in each trial: concentration of HCI~> 0.5M volume HCI added to borax solution (mL) Trial1 2.7 trial2 2.9
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- A 0.3012g sample of an unknown monoprotic acid requires 24.13mL of 0.0944MNaOH for neutralization to a phenolphthalein end point. There are 0.32mL of 0.0997MHCl used for back titration. a. How many moles of OH are used? How many moles of H+ from HCl? _______moles OH ________moles H+ b. How many moles of H+ are there in the solid acid? Use Eq.5. ____________ moles H+ in solid c. What is the molar mass of the unknown acid? Use Eq.4. ____________ g/molWithout doing detailed calculations, sketch the curve for the titration of 30.0 mL of 0.10 M NaOH with 0.10 M HCl. Indicate the approximate pH at the beginning of the titration and at the equivalence point. What is the total solution volume at the equivalence point?A solution of HCl was titrated against sodium carbonate. What is the titer for Trial 1 in the given data? T2 0.3562 0.3479 0.3042 Weight (g) Initial V (ml) 0.80 1.60 35.20 36.70 39.80 Final V (ml) Vol HCI used (ml) 35.10 N of HC (eq/L) 0.1954 0.1870 Average N of HCl (eq/L) A
- 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.Sources of Error Determine the relationship between the observed/apparent value (EX) VERSUS that of the true value (ET) for the quantity being sought by writing either <, >, or = on the space provided TOPIC: Standardization of Titrant Question 7 Distilled water was not equilibrated to room temperature before the preparation of NaOH titrant. EX __ ET TOPIC: Determination of Molar Concentration of each component (Double Indicator Titration) Question 8 No blank correction Ex ___ ET Question 9 Bubbles trapped in the tip of burette: EX ___ ET Question 10 Measuring the sample volume using a volumetric pipet while looking downwards at the meniscus: EX ___ ETConcentration sodium thiosulfate solution used: 0.056 mol L-1 ACCURATE TITRATION VOLUME OF SODIUM THIOSULFATE SOLUTION USED Volume titration 1, (ml) Volume titration 2, (mL) Your Group 15.80 15.75 Group 1 16.05 15.70 Group 2 16.30 16.25 ANALYSIS Average volume used, (mL) Standard deviation Unrounded value Rounded value
- Given [NaOH] of 0.1189 M Calculate Ka1 for each trial. Calculate average Ka1. Calculate Ka2 for each trial. Calculate average Ka2. TRIAL 1: pH at midpoint 1 = 1.8217 pH at midpoint 2 = 6.679 V of NaOH (titrant) needed for 1st equivalence point = 18.50 mL V of NaOH (titrant) needed for 2nd equivalence point = 34.99 mL V of NaOH (titrant) needed for midpoint 1 = 9.25 mL V of NaOH (titrant) needed for midpoint 2 = 26.745 mL TRIAL 2: pH at midpoint 1 = 3.963 pH at midpoint 2 = 9.071 V of NaOH (titrant) needed for 1st equivalence point = 14.78 mL V of NaOH (titrant) needed for 2nd equivalence point = 29.49 mL V of NaOH (titrant) needed for midpoint 1 = 7.39 mL V of NaOH (titrant) needed for midpoint 2 = 22.135 mL TRIAL 3: pH at midpoint 1 = 1.637 pH at midpoint 2 = 6.633 V of NaOH (titrant) needed for 1st equivalence point = 14.72 mL V of NaOH (titrant) needed for 2nd equivalence point = 29.25 mL V of NaOH (titrant) needed for midpoint 1 = 7.36 mL V of NaOH (titrant) needed for…Na2CO3 + HCl -> NaCl + NaHCO3 Na2CO3 served as the primary standard in a titration experiment. Find the molarity of the titrant given the following data in 3 decimal places. Show solutions Primary Standard Used: Na2CO3Formula Mass of 1º standard: 105.99 g/mol% purity of 1º standard: 95% Trial 1 2 3 1º Standard weight, g 0.1005 0.1001 0.0997 Net volume of HCl, mL 9.30 9.00 8.90 Molarity of HCl X1 X2 X32. Measurement of the pK, of Acetic Acid by the Half-Neutralization Method 1.00 Concentration of standardized NaOH titrant mole/L Trial 1 Trial 2 Trial 3 Mass of acetic acid solution 20.0 20.0 Volume of NaOH added to half-neutralize the acetic acid 0.40 mL 0.40 mL mL Measured pH of half-neutralized solution 4.68 4.66 28-7 Average pH value pk - K, = Calculate the [H,0*) and the concentrations of A- and HA, in the half-neutralized solution (Note: In this solution, [H,O*] # [A-].)
- 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.8. The following titration data was collected in a lab. Based on the results, determine the concentration of the aqueous sulfuric acid acid. Concentration of NaOH used: 0.50 M Volume of NaOH used: 50.0 mL Indicator: phenolphthalein Endpoint color change: olorless to pale pink Table 1 Volume of sulfuric acid Required Burette reading (mL) Trial 1 Trial 2 Trial 3 Final reading 31.28 39.17 46.70 Initial reading 1.18 9.08 16.62 Volume H2SO4 used (mL)An automatic titration was performed with the following results: Standardized NaOH Solution Concentration: 0.1191 M Volume of HA- product examined in each trial: 25.00 mL Volume of Standardized NaOH Titrant used to achieve the first equivalence point: Trial #1: 1.300 mL Trial #2: 1.137 mL Trial #3: 1.140 mL Calculate the %(w/v) for each trial, Average Concetration (%), Deviation (%), Standard Deviation (%), and RSD (%)
