Calculate the hydroxide ion concentration in a 0.0500 M NaOCl solution. The acid dissociation constant for HOCl is 3.0 x 10^-8.

What mass of hydrochloric acid (in grams) can be neutralized by 2.2 g of sodium bicarbonate? (Hint: Begin by writing a balanced equation for the reaction between aqueous sodium bicarbonate and aqueous hydrochloric acid.)

A phosphate buffer contains 0.075M K₂HPO₄ and 0.125M KH₂PO₄. pKa values for H₃PO₄ are 2, 6.8, and 12.2. Calculate the concentrations of:

1.) H₂PO₄^- concentration

2.) H⁺ concentration

In what direction will the water activity of a liquid food change (higher, lower, or virtually unaltered) if the following changes occur, keeping other factors constant? In each case give an explanation.

1. Addition of sodium chloride

2. Addition of native starch (granules)

3. Heating the food with starch and cooling again to the original temperature without loss of water

4. Enzymatic hydrolysis of the protein present

5. Emulsifying oil into it

6. Freezing part of the water

Three moles of an ideal gas expand isothermally and reversibly from 90 to 300 L at 300 K.

a) Calculate ΔUm, ΔSm, w per mole, and q per mole.

b) If the expansion is carried out irreversibly by allowing the gas to expand rapidly into a vacuum, determine ΔUm, ΔSm, w per mole, and q per mole

You work in a medical research lab with a biochemist who asks you to make a 1.00 L phosphate buffer stock solution with pH = 7.4. The total phosphorus concentration is to be 0.250 M. In the storeroom, there are the following reagents: (1) a 3.00 M phosphoric acid stock solution, (2) solid sodium dihydrogen phosphate, (3) solid sodium monohydrogen phosphate, (4) solid, sodium phosphate, (5) a 3.00 M HCl(aq) stock solution, (6) a 3.00 M NaOH(aq) stock solution, and (7) deionized water.

(i) (2 pts) To make an optimum buffer, it is important that the pKa of the acid part is close to the target pH of the buffer. Which phosphate species has a pKa value closest to pH = 7.4?

(ii) (4 pts) Choose this phosphate species (in i) as the only phosphorus component. What amounts of this substance and any other reagents (grams of solid(s); mL of any solution(s) and water) would you need to make the buffer with pH = 7.4?

(iii)(4 pts) Choose this phosphate species (in i) and either its conjugate acid or base as the only two phosphorus components. What amounts of this substance, its conjugate acid or base, and water (grams of solid(s); mL of any solution(s) and water) would you need to make the buffer with pH = 7.4?

Why can the Drude equation not be applied in the range of wavelengths near maximum absorbance?

An antifreeze protein, with a molecular weight of 17000 Da, was found to be present at a concentration of 10g dm-3 in the serum of an Antarctic fish. calculate the expected depression of the freezing point and compare your result with 1) the observed depression of 0.6K and 2) the depression of 0.0014K observed for 10g dm-3 solution of lysozyme, molecular weight of 14500 Da. for pure water, Lf=6.02kj ml-1 and Tm=273.15 K

A) how many grams of Zinc (II) Nitrate would be required to produce 350 ml of a .50 M solution?

Water is Unusual because...(Choose All true)

- soilid phase is less compact than the liquid phase.

-Most molecules as small as water are gases at room temperature

-most molecules as small as water have higher boiling points than water does

-its very strong hydrogen bonding and polarity (among other things) give it unusual properties

25.0 mL of a 1.00 M Fe(No3)2 solution was reacted with 25.0 mL of a 0.700M solution of K3PO4 to produce the solid Fe3(PO4)2 by the balanced chemical equation

3 Fe(NO3)2(aq)+ 2 K3PO4(aq)--->Fe3(PO4)2(s)+ 6 KNO3(aq)

What is the limiting reagent?

How many grams of Fe(PO4)2 will be produced?

3a. Consider the reaction when aqueous solutions of chromium(II) nitrate and barium iodide are combined. The net ionic equation for this reaction is:

3b. Consider the reaction when aqueous solutions of zinc sulfate and iron(III) acetate are combined. The net ionic equation for this reaction is:

3c. Consider the reaction when aqueous solutions of sodium nitrate and barium hydroxide are combined.

The net ionic equation for this reaction is:

3d. Consider the reaction when aqueous solutions of sodium hydroxide and potassium acetate are combined.

The net ionic equation for this reaction is:

3e. Consider the reaction when aqueous solutions of potassium iodide and ammonium carbonate are combined.The net ionic equation for this reaction is:

3f. Consider the reaction when aqueous solutions of magnesium sulfate and sodium phosphate are combined. The net ionic equation for this reaction is:

3g. Consider the reaction when aqueous solutions of barium nitrate and sodium sulfide are combined.The net ionic equation for this reaction is:

3h.Consider the reaction when aqueous solutions of ammonium sulfide and barium acetate are combined. The net ionic equation for this reaction is:

3i. Consider the reaction when aqueous solutions of iron(III) iodide and sodium phosphate are combined. The net ionic equation for this reaction is:

3j. Consider the reaction when aqueous solutions of lead(II) acetate and barium hydroxide are combined. The net ionic equation for this reaction is:

Answer all parts please! :)

Sketch the d-orbital splitting for [Ru(bpy)₃]²⁺, and populate it with electrons.

From part c (and consulting an appropriate Tanabe-Sugano diagram), how many d-d transitions are spin-allowed? List them.

Sketch the excited-state d-orbital splitting.

What is the ground-state term symbol for [Ru(bpy)₃]²⁺?

Would you expect to see a Jahn-Teller distortion? Explain.

Identify the hybridization of each interior atom of CCl☰C-CH3?

In order to separate the two dyes bound the column a solution is needed with a substance that has higher affinity for the column than the dyes. Isopropyl alcohol is such a substance. If a solution of water with 70% isopropyl alcohol is applied all the purple dye elutes (comes off) the column and the dyes do not separate. In fact this is how students clean the column before reuse of the column. Read your protocol and write down the other two concentrations of isopropyl alcohol here. Why are we using two different concentrations of isopropyl alcohol?