Select Weak Acid as the analyte in the titration interactive. Analyte, 25.0 ml. Weak Acid, 1.0... Determine the pK, of this weak acid. colortess Indicator No Indicator 14 13.83 pK, = Incorrect PH=2.50 25 50 Titrant Added (mL) Titration Curve Concentration Chart Titrant: Strong Base, 1.0 M MOH 50 0.0 ml + Hd

Select Weak Acid as the analyte in the titration interactive. Analyte, 25.0 ml. Weak Acid, 1.0... Determine the pK, of this weak acid. colortess Indicator No Indicator 14 13.83 pK, = Incorrect PH=2.50 25 50 Titrant Added (mL) Titration Curve Concentration Chart Titrant: Strong Base, 1.0 M MOH 50 0.0 ml + Hd

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter8: Polyfunctional Acids And Bases

Section: Chapter Questions

Problem 10P

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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: Measured mass of the precipitate 1. Filter paper was dried prior to filtration. EX _____ ET TOPIC: Standardization of Titrant 2. 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) 3. No blank correction EX ______ ET
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 ___ ET
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 X3
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Given the chemical equation for the anthocyanin extract of red cabbage as an indicator. HIn + H2O ⇌ H3O+ + In- Using the results from the experiment, identify which of the reactant/product are responsible for the red and green color of the indicator.Notes: solution turns red after adding acid; solution turns blue/green after adding base RED: ________________________ BLUE/GREEN: ________________________ Why is the color violet/blue at pH near 7? Answer in 1 sentence. Hint: What is the relationship of the species responsible for the observed colors? __________________________________________________________________
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