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- 1.Determine the color of the indicator in a given condition: METHYL ORANGE IN AN ACIDIC ENVIRONMENT. 2.This is the measure of reproducibility of data within a series of results. 3.This is the chemical to be subjected to testing in titrimetric method of analysis. 4.Determine the type of assay employed for this substance: TARTARIC ACID 5.Determine the color of the indicator in a given condition: PHENOLPHTHALEIN IN AN ALKALINE ENVIRONMENT. Please help me answer this questions. the answers are on the image I attachedAn indicator with an acid dissociation constant of 2.19 x 10‑5 could typically be used for a solution with pH 3.66 True or False?What conditions must be followed to perform complexometric titration?
- The indicator ethyl red has Ka = 3.8 x 10-6. Over what approximate pH range does it change color?hexamethylenetetramine. Qualitative and quantitative analysis?Phenolphthalein, a colorless weak acid (Ka = 6.31 x 10^-10) which dissociates in water forming pink anions is widely considered a suitable indicator for this titration. Along with a suitable calculation, find the working/useful range of this indicator to explain its use.
- An unknown solution is blue with indigo carmine and blue with thymolphthalein. From that information, predict the approximate pH range of the unknown solution, then determine the colour of the following indicators in that solution. Indicator Colour alizarin yellow R yellow/red/orange phenolphthalein colourless/pink thymol blue yellow/red/orange/green/blueSuppose 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 themTopic: Acid-Base Titration What is a primary standard? What are the requirements to consider a substance a primary standard?
- Why doesn’t the addition of an acid-base indicator affect the pH of the test solution?For bromocresol green indicator, the pka of the indicator is about 4.7. Estimate the pH range over which the color change occurs for bromocresol green. What would be the effect on your results if methyl red indicator, pka = 5.0 were used during the experimentGiven 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? __________________________________________________________________