What is going on in the hexane layer at the end of a Group I Anion experiment? On a qualitative Analysis for Anions experiment, to a sample, I had to add 3 M HNO3 until it was just acidic. Then, I had to add 3 drops of NaOCl solution then 1mL hexane. After shaking it well, if the solution was yellow, the anion was Br-. If the solution was brown or purple, it was a I- Anion. What is going on with the hexane layer? What does it have to do with the periodic table?

A sample containing BTEX What is the appropriate quantitative and qualitative analysis method for it in the laboratory?

If the indicator molecule is a weak acid (HA), explain what happens to the molecule when it is at low pH and high pH?

At which point in the titration curve shown below is the number of moles of acid greater than the moles of base? 지A B C Volume titrant added (mL) A. O Point A В. О Рoint B С. О Рoint C D. O Point D

How many mL of 0.022 M HCl would it take to completely neutralize 14.11 mL of 1.16 M Ca(OH)2 according to the following reaction equation. 2HCl + Ca(OH)2 --> 2H2O + CaCl2

5 b) Benzoic acid, HC7H5O2, is a weak monoprotic acid. A stock HC,H5O2 solution with unknown concentration was prepared. A 25.00 mL sample of the stock HCH5O2 solution was titrated with 0.1234 M sodium hydroxide to the equivalence point, using phenolphthalein as an indicator. The titration took 20.26 mL of titrant (sodium hydroxide). (b) Write a balanced complete ionic equation for the chemical reaction that occurs in this titration.

What is the calcium ion concentration in a solution prepared by mixing 407 mL of 0.447 M calcium nitrate with 429 mL of 0.271 M sodium fluoride? The ?sp of calcium fluoride is 3.45×10^−11

A student is asked to standardize a solution of calcium hydroxide. He weighs out 0.952 g potassium hydrogen phthalate (KHC8H4O4, treat this as a monoprotic acid).It requires 35.7 mL of calcium hydroxide to reach the endpoint.A. What is the molarity of the calcium hydroxide solution?  This calcium hydroxide solution is then used to titrate an unknown solution of nitric acid.B. If 15.6 mL of the calcium hydroxide solution is required to neutralize 29.1 mL of nitric acid, what is the molarity of the nitric acid solution?

2. A student titrates 30.50 mL of a 4.50 g/L monoprotic acid (HA) with 25.00 mL of 0.10 M NaOH solution. a. Determine the concentration of the monoprotic acid (the ratio of the acid to base is 1:1). Concentration (2) = 4.50 30.50mL b. Determine the molar mass of the acid. = 147.542 M=4-50 = 180 0.0025 3. Determine the K, for a monoprotic weak acid with a pH of 3.5 at half the equivalence point. Ka = 10-3.5 4. What color will the solution turn indicating that the equivalence point has been reached?

Calculate the molarity of an NaOH solution from the following titration data.  Be sure the answer has the correct amount of significant figures.  The chemical equation for this titration is as follows: NaOH  +  KHP  ⟶  NaKP  +  H2O NaOH buret reading, inital:  15.27 mL NaOH buret reading, final:     8.32 mL Mass of KHP (204.22 g/mol):  1.1592 g Calculate the molarity of an NaOH solution from the following titration data.  Be sure the answer has the correct amount of significant figures.  The chemical equation for this titration is as follows: NaOH  +  KHP  ⟶  NaKP  +  H2O NaOH buret reading, inital:  15.27 mL NaOH buret reading, final:     8.32 mL Mass of KHP (204.22 g/mol):  1.1592 g