1A. Determine the pH of a KOH solution made by mixing 0.251 g KOH (s) with enough water to make 1.00 × 102 mL of solution. Assume 100% purity for the KOH (s).

1B. Predict the direction in which the equilibrium will lie for the following reaction:     H3PO4(aq) + HSO4−(aq) H2PO4−(aq) + H2SO4(aq).    Ka1(H3PO4) = 7.5 × 10−3;

Ka(H2SO4) = very large    

2. For H3PO4, Ka1 = 7.3 × 10−3, Ka2 = 6.2 × 10−6, and Ka3 = 4.8 × 10−13. An aqueous solution of Na3PO4 therefore would be?

2B. Calculate the pH of a solution of 0.10 M HA- (aq). The acid H2A has Ka1 = 6.5 × 10−2 and Ka2 = 6.1 × 10–5.  

HClO(aq) = Cl2 (aq) E^o = + 1.611V

MnO4^-1(aq) = MnO2(s) E^o = + 1.679V

In a particular cell, E_cell is measured to be +0.038v when the pH in both half-cells is 4.00 and [Cl2] = 0.20 M, [HClO] = 0.10 M. What is [MnO4^-1] in the solution?

A student is given two unknown samples continuing two different compounds with the same molecular formula, C3H7NO, he annaylzes them by IR and 1H NMR

Compound A:

IR: 3366, 3189, 2976, 1662 cm-1

1H NMR: 1.15 ppm, 3H, t

2.24 ppm, 2H, q

6.21 ppm, 2H, broad

Compound B:

IR: 3294, 3099, 2946, 1655 cm-1

1H NMR: 1.98 ppm, 3H, s

2.79 ppm, 3H, s

6.40 ppm, 1H, broad

Identify the structure of each compound and justify your answer.

Use Molecular Orbital Theory to describe bonding in the following. Also find the bond order and decide if stable or not. Is species dia or paramagnetic?

i. C₂⁺   ii. Be₂⁺   iii. Ne₂

Discuss the nature of the three main types of atomic line broadening and include the relative magnitude of broadening for each. Also, discuss what can be done, if anything, to reduce the magnitude of each type in specific experiments.

Calculate the percent ionization of formic acid solutions having the following concentrations. Ka = 1.8x10-4

Part B 0.460 M Express your answer using two significant figures.

Express your answer using two significant figures.

c) 0.110 M Express your answer using two significant figures.

d)5.40×10−2 M Express your answer using two significant figures.

What volumes of 0.53 M HNO₂ and 0.53 M NaNO₂ must be mixed to prepare 1.00 L of a solution buffered at pH = 3.25?

Calcuate the pH when 80 mL of 1.25 M HCL is added to 779 mL of 1.60 M of sodium acetate.

Please show all calculations. Thanks! :)

For

the

questions

below,

give

full

structural

diagrams

and

names

for

all

reactants

and

products.

Also

indicate

the

TYPE

OF

REACTION.

2. The

formation

of

2,2--?pentanediol

from

1--?pentyne.

3. The

reaction

between

trans--?2--?hexene

with

hydrogen

bromide.

4. The

formation

of

2--?butanol

from

an

alkene.

5. The

reaction

between

2

moles

of

water

with

2--?pentyne.

6. The

oxidation

of

2--?butanol.

7. The

combustion

of

2--?pentanol.

8. Show

the

formation

of

2--?butene

from

an

alcohol.

9. Show

the

reaction

between

water

and

cyclohexene.

1) A 28.6 mL sample of 0.226 M methylamine, CH₃NH₂, is titrated with 0.221 M nitric acid.
After adding 11.5 mL of nitric acid, the pH is

2) A 24.0 mL sample of 0.372 M methylamine, CH₃NH₂, is titrated with 0.381 M hydrochloric acid.
After adding 35.9 mL of hydrochloric acid, the pH is

It takes 41.0 min for the concentration of a reactant in a first-order reaction to drop from 0.430 M
to 0.310 M at 25.0 ^oC. How long will it take for the concentration to reach 0.126 Molar?

EDTA: Dry Na2H2EDTA • 2H2O (FW 372.25) at 80 oC for 1 h and cool in the desiccator. Accurately weigh out 0.6045g and dissolve it with heating in 400 ml of DI in a 500-ml volumetric flask. Cool to room temperature, dilute to the mark, and mix well.

Pipet a 25.00 ml sample of the unknown into a 250-ml flask. Dilute with an additional 25 ml of DI H2O (you can use a graduated cylinder for the water addition, it is added to help clarify the color change). To each sample add 3 ml of pH 10 buffer and a 2 drops of Eriochrome black T indicator. Titrate with EDTA from your 50-ml buret and note when the color changes from wine red to blue.

Using these results,

[1] calculate the molarity of EDTA.

[2] calculate [Ca2+] ion and [Mg2+] ion for each?

[3] calculate the average concentration of Ca2+ and Mg2+ for each.

[4] calculate the water hardness in terms of CaCO3

Please show work!