The following indicators were used in a solution with the provided pOH or hydronium concentration. Select the correct colour that the indicator would be. Indicator Measurement Colour of Indicator alizarin yellow Рон - 2.5 Indicator Measurement Colour of Indicator chlorophenol red [H30*(aq)] - 5.0 x 10-4 mol/L

The following indicators were used in a solution with the provided pOH or hydronium concentration. Select the correct colour that the indicator would be. Indicator Measurement Colour of Indicator alizarin yellow Рон - 2.5 Indicator Measurement Colour of Indicator chlorophenol red [H30*(aq)] - 5.0 x 10-4 mol/L

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter14: Principles Of Neutralization Titrations

Section: Chapter Questions

Problem 14.9QAP

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Given three acid-base indicatorsâ€”methyl orange (end point at pH 4), bromthymol blue (end point at pH 7), and phenolphthalein (end point at pH 9)â€”which would you select for the following acid-base titrations? (a) perchloric acid with an aqueous solution of ammonia (b) nitrous acid with lithium hydroxide (c) hydrobromic acid with strontium hydroxide (d) sodium fluoride with nitric acid
The acid-base indicator "Thymol Blue" has two transition ranges as listed below (with the corresponding acid dissociation constants): 7. Ka AcidColour BaseColour Thymol Blue 1 Thymol Blue 2 2.24 x 102 Red Yellow 1.26 x 10 Yellow Blue What colour would you expect it to be at the following pH values? Briefly justify your answers. (a) (b) (c) (d) 0.9 5.2 7.8 10.7
The following indicators were used in a solution with the provided pOH or hydronium concentration. Select the correct colour that the indicator would be. Indicator Measurement Colour of Indicator phenol red pOH = 6.8 Indicator Measurement Colour of Indicator bromocresol green [H3O+(aq)] = 2.5 x 10-4 mol/L
The indicator meta-cresol purple is an acid with a Ka of 3.1 ✕ 10−2. In a 2.2 ✕ 10−4 M solution, it is red in acid and yellow in base. Calculate the pH range over which it goes from 10.% ionized (red) to 90.% ionized (yellow). (a) pH at 10.% ionized
16,2 Describe the effect on pH (increase, decrease, or no change) that results from each of the following addi- tions: (a) potassium acetate to an acetic acid solu- tion; (b) ammonium nitrate to an ammonia solution; (c) sodium formate (HCOONA) to a formic acid (HCOOH) solution; (d) potassium chloride to a hy- drochloric acid solution; (e) barium iodide to a hy- droiodic acid solution.
The table below contains data about common indicators and the pH range at which they are effective. Indicator pH range phenolphthalein 8.00 – 10.00 methyl orange 3.00 – 5.00 litmus 6.00 – 8.00 c. Use the pH curve, and the information show in the table above, to select the most appropriate indicator to show the end-point of this titration. State the colour change that would be observed.
Limestone consists mainly of the mineral calcite, CaCO3. The carbonate content of 0.5143 g of powdered limestone was measured by suspending the powder in water, adding 10.00 mL of 1.396 M HCl, and heating to dissolve the solid and expel the CO2: CaCO3(s) + 2H+ ⟶⟶ Ca2+ + CO2↑↑ + H2O The excess acid requied 39.96 mL of 0.1004 M NaOH for complete titration: OH- + H+ ⟶⟶ H2O Find the weight percent of calcite in the limestone.
Bromothymol blue is yellow in acid solutions. HBB is acidic form of the indicator . The indicator is blue in basic solutions. BB- is basic form of the indicator. HBB + H2O H3O+ + BB- In this case, HBB is an acidic form of the indicator. BB- is the basic form of the indicator. The acidic form is yellow in color and the basic form is the blue color. (a) Predict what will happen if NaOH is added to the reaction system. explain why ? make sure to explain why?
NiCO3 (s) ---> Ni^2+(aq) + CO3^2-(aq) K1 = 6.6 x 10^-9 HCO3^-(aq) + H2O(ℓ) CO3^2-(aq) + H3O^+(aq) K2 = 4.8 x 10^-11 equilibrium constant for the following reaction NiCO3(s) + H3O^+(aq) ---> Ni^2+(aq) + HCO3^-(aq) + H2O(ℓ) K3 = ?
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
Suppose that you want to titrate a sample of vinegar with standard sodium hydroxide solution to determine the concentration of acetic acid in it, and you want to use an indicator to help you determine the end-point. Which of the following indicator would be suitable? (A) Bromocresol Green (Ka ~ 2.0 x 10–5; color: yellow in acid; blue in base) (B) Methyl Red (Ka ~ 5.0 x 10–6; color: red in acid; yellow in base) (C) Bromothymol Blue (Ka ~ 6.0 x 10–8; color: yellow in acid; blue in base) (D) Any of them
The protonated form of the indicator (Hln) is red. Hln dissociates into a yellow, deprotonated form(ln-) as shown in the reaction. The pKa this indicator is 3.4 Hln(aq)=H+(aq) + ln-(aq) What is the color of a solution containing the indicator at pH=2? What is the color of a solution containing the indicator at pH=3? What is the color of a solution containing the indicator at pH=6?