Question: Explain whether the technique errors will result in high or low experimental determination of the molar concentration of CH3COOH in vinegar. 1. A student uses the pipet bulb to blow the last bit of vinegar sample from the tip into the titration flask, after the pipet is drained. 2. A student fails to clean the pipet first, After delivering the vinegar sample, the student notices a drop of vinegar clinging to the inner surface of the pipet. 3. A student stops the titration when the pink persists throughout the solution for less than 10 seconds after completing the titration, a student notices that buret is not clean. Droplets of NaOH solution are clinging to the inner surface of the buret. Briefly explain why adding distilled water to the vinegar sample prior to the beginning titration does not affect the results of your determination of the molarity of CH3COOH in your vinegar sample.

Sodium carbonate (2.4134 g) is dissolved in enough deionized water to give a solution with a total volume of 250.0 mL. What is the pH of the resulting solution? Hint: For carbonic acid, pKa1 = 6.351 and pKa2 = 10.329. What is the equilibrium concentration of H2CO3 in the solution? calculate the value of alpha HCO3-

A.) 0.85 g of hydrogen chloride (HCl) is dissolved in water to make 8.0 L of solution. What is the pH of the resulting hydrochloric acid solution?

B.) 0.50 g of sodium hydroxide (NaOH) pellets are dissolved in water to make 6.5 L of solution. What is the pH of this solution?

Discuss what influence temperature has on molecular motions and how it would impact the reaction in Part II.

Part II. Temperature Dependence in a Complex Ion EquilibriumMetal ions such as Co2+ will form complex ions, where ligands surround the metal ion. A ligand
is either a molecule or ion that donates electron density to the metal ion to form a bond.Examples of ligands include H2O, NH3, Cl-, and OH-. CoCl2(H2O)2 is a complex metal ion withtwo Cl- (chloro) and two H2O (aqua) ligands surrounding the Co2+ in a tetrahedral geometry.Co(H2O)6

2+ is also a complex ion with six water molecules (aqua ligands) surrounding the

central metal ion, Co2+, in an octahedral geometry.

In aqueous solution, we can observe the conversion between the tetrahedral complex ion,
CoCl2(H2O)2, which is blue, and the hydrated octahedral complex ion, Co(H2O)6

2+, which is pink,

according to the following equilibrium.

CoCl2(H2O)2 + 4 H2O  Co(H2O)6

2+  + 2 Cl-

     blue       pink

By dissolving CoCl2∙(H2O)6 in methanol, the solution obtained is between blue and pink.

Suppose a soap manufacturer starts with a triglyceride that has the fatty acid chains arachidonic acid, palmitoleic acid and linoleic acid attached to the three backbone carbons. The manufacturer saponifies the triglyceride with NaOH. What are the fatty acid soaps that are produced in the process?

How many photons are produced in a laser pulse of 0.616 J at 529 nm?

Carbon disulfide is prepared by heating sulfur and charcoal. The chemical equation is

S2(g) + C(s) <---> CS2(g)

How many grams of CS2(g) can be prepared by heating 21.0 moles of S2(g) with excess carbon in a 9.15 L reaction vessel held at 900 K until equilibrium is attained?

Determine the catalyst activity of trypsin.

Develop a procedure to determine the ideal gas law constant R from:

NaHCO3 (s) + CH3COOH (aq)--> NaCH3COO (aq) + CO2(g) + H20 (l)

so that different amounts of CO2 will be produced and collected from NaHCO3 powder and ~0.5 mol/L CH3COOH solution and the following equipment: test tubes, small vials, stopper, tubing, water trough, graduated cylinders, and erlemeyer flasks. Please help!

Use the thermodynamic arguement to explain why the perfectly folded protein is only marginally stable compared to its unfolded form.

Use the same equation to explain why higher temperatures denature proteins.

Which of the weak forces is the most important in the overall protein stability?

How does the packing found inside a fractional column work to separate a mixture of two components?

Using your average K_eq value (.3948), please calculate what the equilibrium concentrations of Fe³⁺ , SCN^- , and FeSCN²⁺ in a solution made by combining 10.00mL of 0.0020M Fe(NO₃)₃ and 10.00mL of 0.0020M KSCN.

Explain the effects of each of the following on the rates of gluconeogenesis and/or glycolysis.

A. Increasing the concentration of blood glucose.

B. Increasing the concentration of glucose-6-phosphate.

C. Increasing the concentration of fructose-1,6-bisphosphate.

D. Increasing the levels of ATP.

E. Increasing the concentration of AMP.

F. Decreasing the concentration of fructose-2,6-bisphosphate

G. Increasing the concentration of acetyl CoA

H. Increasing the concentration of citrate.

3/ At 2000 K , nitrogen gas and oxygen gas combine to form nitric oxide according to the following reaction: N2(g) + O2(g) ⇌ 2NO(g) ΔH = +1.81 KJ

with an equilibrium constant K of 4.1 x 10^-4. If 0.50 mole of N2 and 0.86 mole of O2 are put into a 2.0 L container at 2000 K , what would the equilibrium concentrations of all species be ?

4/ For the reaction in question #3. How would the following changes effect the equilibrium ? Each change occurs independently of the others. Increase temperature. Decrease pressure. Decrease [O2(g)]. Increase [NO(g)]

Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.140 M HClO(aq) with 0.140 M KOH(aq). The ionization constant for HClO is 4.0x10^-8. (a) before addition of any KOH (b) after addition of 25.0 mL of KOH (c) after addition of 35.0 mL of KOH (d) after addition of 50.0 mL of KOH (e) after addition of 60.0 mL of KOH