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What pH would you make the water layer in order to cause both compounds to dissolve...
A.) What factors cause the order of elution to change? B.) If two unknown compounds are analyzed via thin-layer chromatography first using pure petroleum ether as the eluant and then 75:25 petroleum ether-ethyl acetate, how will the Rf values between plates change or can you not tell with the given information?
What mass of benzoic acid, C6H5COOH, would you dissolve in 300.0 mL of water to produce a solution with a pH = 2.75? C6H5COOH+H2O⇌H3O++C6H5COO−Ka=6.3×10−5 Express your answer using two significant figures.
What mass of CuSO4 would you have to dissolve in 1L of water to make 500 ppm solution of CU^2+?
0.10 g of hydrogen chloride (HCl) is dissolved in water to make 2.5 L of solution. What is the pH of the resulting hydrochloric acid solution? Express the pH numerically to two decimal places. 0.20 g of sodium hydroxide (NaOH) pellets are dissolved in water to make 6.5 L of solution. What is the pH of this solution? Express the pH numerically to two decimal places.
Which of the following compounds would make the best buffer at pH 7.5? Acetic acid, pKa= 4.76 N-tris(hydroxymethyl) methylglycine (Tricine), pKa = 8.15 N-2-hydroxyethylpiperazine-N’-ethansulfonic acid, pKa2= 7.6 Glycine, pKa2= 9.9 Tris(hydroxymethyl)aminomethane (Tris), pKa = 8.3 I believe 3 is the correct answer and therefore I am trying to answer the below question with this information. Using the answer that you selected from question 1 above: a. Explain how you would make the buffer starting with 1M HA and 1M A-...
PART A How many grams of ethanol, CH3CH2OH, should you dissolve in water to make 0.400 L of vodka (which is an aqueous solution that is 6.86 M ethanol)? Express your answer with the appropriate units. PART B Using the density of ethanol (0.789 g/mL), calculate the volume of ethanol you need to make 0.400 L of vodka. Express your answer with the appropriate units.
Would the methylene chloride layer be above or below the experiment? Justify your answer. 1. aqueous layer in today's ium carbonate used in the isolation of caffeine? Be specific as to the 2. Why is potass chemical species the carbonate may act on. Why was sodium sulfate used? 3. 4. After introducing 1.0 g of potassium carbonate into the centri hot water extract, it was capped, shaken, and then cooled to room temperature. Following this, roug minute. Why wasn't the...
Exercise 2 Separation of a Mixture Based on Acid-Base Properties One purpose of this exercise is to learn how to use a separatory funnel to extract a single component away from other compounds in solution. To do so, we will apply the principles of solubility and acid-base behavior you’re seeing in class. One of the compounds is neutral in the acid-base sense. It has no ability to either donate or accept a proton from an aqueous solution, and will remain...
QUESTION 16 For compounds of similar molecular weight, which of the following would you expect to have the highest boiling point? O An alkane O An ether O A primary amine The compounds should have approximately the same boiling point. QUESTION 17 Lipoproteins are examples of: O Steroids Eicosanoids O Glycolipids O Complex lipids QUESTION 18 All amino acid molecules contain oxygen atoms. True False
Part A 0.30 g of hydrogen chloride (HCl) is dissolved in water to make 2.5 L of solution. What is the pH of the resulting hydrochloric acid solution? Express the pH numerically to two decimal places. View Available Hint(s) A O ? O A pH = 2.56 Submit Previous Answers X Incorrect; Try Again; 3 attempts remaining Part B 0.35 g of sodium hydroxide (NaOH) pellets are dissolved in water to make 6.5 L of solution. What is the pH...