Which of the following statement regarding EDTA titration is incorrect * cou bonua inw woled nol Mark only one oval. HOSH In normal direct titration, the color of the endpoint is from the metal-indicator complex CMs In back titration, excess EDTA is titrated with another standard solution of a second metal ion In indirect titration, the analyte can not be titrated against EDTA In masking titration, the sample or the interference can be isolated by "masking 00

Which of the following statement regarding EDTA titration is incorrect * cou bonua inw woled nol Mark only one oval. HOSH In normal direct titration, the color of the endpoint is from the metal-indicator complex CMs In back titration, excess EDTA is titrated with another standard solution of a second metal ion In indirect titration, the analyte can not be titrated against EDTA In masking titration, the sample or the interference can be isolated by "masking 00

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter21: Potentiometry

Section: Chapter Questions

Problem 21.25QAP

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A 100-mL sample of hard water is titrated with the EDTA solution in Problem 2. The same amount of Mg2 is added as previously, and the volume of EDTA required is 31.84 mL. a. What volume of EDTA is used in titrating the Ca2 in the hard water? _____________mL b. How many moles of EDTA are there in that volume? _____________ moles c. How many moles of Ca2 are there in the 100 mL of water? _____________ moles d. If the Ca2 comes from CaCO3, how many moles of CaCO3 are there in one liter of the water? How many grams of CaCO3 are present per liter of the water? _____________ mol / L _____________ g / L e. If 1 ppm CaCO3 = 1 mg per liter, what is the water hardness in ppm CaCO3? _____________ ppm CaCO3
Which of the following statement regarding EDTA titration is incorrect In back titration, excess EDTA is titrated with another standard solution of a second metal ion In normal direct titration, the color of the endpoint is from the metal-indicator complex In indirect titration, the analyte can not be titrated against EDTA In masking titration, the sample or the interference can be isolated by "masking"
Which of the following statement regarding EDTA titration is incorrect A. In indirect titration, the analyte can not be titrated against EDTA B. In normal direct titration, the color of the endpoint is from the metal-indicator complex C. In back titration, excess EDTA is titrated with another standard solution of a second metal ion D. In masking titration, the sample or the interference can be isolated by "masking"
What species are present in a solution giving off a pure blue endpoint in a hard water sample containing an EBT indicator (In) with an EDTA titrant? a. HIn²⁻, CaY²⁻, MgY²⁻ b. HIn²⁻, MgIn⁻, CaY²⁻, MgY²⁻, CaIn⁻ c. HIn²⁻, MgIn⁻ d. HIn²⁻, MgIn⁻, CaY²⁻
Advantages of potentiometric titrations over 'classical' visual indicator methods: (select the correct statement(s)). Can be used for colored, turbid or fluorescent analyte solution. Can be used if there is no suitable indicator or if the color change is difficult to visualize. Both answers 1 and 2 are correct
When all of the calcium ions in the titrant is consumed, the EDTA will complex next with the indicator.(true or false) At the equivalence point, the indicator in the Mg-indicator complex is displaced by EDTA resulting in the release of the free indicator. (true or false)
Which of the following statements CORRECTLY describes a EDTA titration? a. All statements are correct. b. Erichrome black T has the same endpoint with Calmagite indicators and its solution is more stable than the Calmagite. c. EDTA titration can be used only for direct titration methods. d. EDTA Titration can be used in determination of all cations. e. EDTA titration is usually used in the determination of water hardness.
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
A. .Sodium tetraphenylboron is the titrant for what precipitimetric method. B.
Using the derived endpoints for both phosphoric acid titrations, calculate theconcentration of the phosphoric acid solution and report the mean value. Vol Mid Point 1st Derivative 3.96 0.089821268 5.91 0.229138878 7.105 0.257152358 8.345 0.562805368 9.025 1.958394009 9.175 4.406074475 9.215 10.52631579 9.27 5.043426253 9.355 4.129394633 9.415 7.738714375 9.465 2.260096883 9.505 13.04347826 9.605 1.258033788 9.8 0.85812357 10 0.845641773 10.25 0.636571666 10.65 0.415019763 11.2 0.31048471 11.95 0.277373275 12.925 0.270438943 13.875 0.273865319 14.55 0.391304348 15.025 0.421607378 15.425 0.567030224 15.7 0.934574579 15.9 0.898689411 16.05 1.831703765 16.125 4.911587269 16.175 4.137715831 16.25 3.061160807 16.325 7.932182234 16.375 6.403162055 16.45 3.070522155 16.55 1.981485334 16.675 1.751612232 16.875 0.8562513 17.075 1.352194716 17.375 0.427848277 17.85 0.434990639 18.475 0.249635948 19.275…
TRUE OR FALSE: At the start of EDTA titration, the color of the solution is due to the free form of the indicator.
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: Determination of Molar Concentration of each component (Double Indicator Titration)1. No blank correction Ex _______ET2. Bubbles trapped in the tip of burette: EX ______ ET3. Measuring the sample volume using a volumetric pipet while looking downwards at the meniscus: EX _____ ET