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!

Determination of the Calcium Content of Beer and Water Using Atomic Absorption Spectroscopy

1. Assuming the wort is saturated with Ca3(PO4)2(s), what would happen to the concentration of Ca2+ions in the wort if: (i) More HPO42-ions were added? PO43- Concentration will increase (ii) Ca3(PO4)2 (s) was added? (iii) The pH of the solution was decreased by addition of a suitable acid?

2. Why is LaCl₃ utilized? What changes would be needed in set up of the AAS if LaCl₃ was not used

3. If your two highest concentrations for the calibration both have an absorbance of about 2, what is the problem and how you would correct it?

From the following heats of combustion,

CH₃OH(l) + 3/2O₂(g) → CO₂(g) + 2H₂O(l)        ΔH^o_rxn= –726.4 kJ/mol

C(graphite) + O₂(g) → CO₂(g)                               ΔH^o_rxn = –393.5 kJ/mol

H₂(g) + ½O₂(g) → H₂O(l)                                                  ΔH^o_rxn = –285.8 kJ/mol

Calculate the enthalpy of formation of methanol (CH₃OH) from its elements.

C(graphite) + 2H₂(g) + ½O₂(g) → CH₃OH(l)

A student is running an experiment in which 73.4 grams of BaI2 is needed, but the only jar of reagent in the lab is labelled barium iodide dihydrate. How many grams of the hydrate must the student weigh out in order to get the desired amount of the anhydrous compound?

1. How many GRAMS of potassium are present in 1.73 grams of potassium chromate, K₂CrO₄ ?
grams potassium.

How many GRAMS of potassium chromate can be made from 2.35 grams of potassium ?
grams potassium chromate.

Consider the following reaction: COCl2(g) CO(g) + Cl2(g) If 6.56×10-3 moles of COCl2, 0.377 moles of CO, and 0.372 moles of Cl2 are at equilibrium in a 16.9 L container at 772 K, the value of the equilibrium constant, Kp, is

2.A student ran the following reaction in the laboratory at 597 K:

COCl2(g) CO(g) + Cl2(g)

When she introduced COCl2(g) at a pressure of 0.710 atm into a 1.00 L evacuated container, she found the equilibrium partial pressure of COCl2(g) to be 0.299 atm.  

Calculate the equilibrium constant, Kp, she obtained for this reaction.  

Consider the following reaction where Kp = 1.57 at 600 K: CO(g) + Cl2(g) COCl2(g) If the three gases are mixed in a rigid container at 600 K so that the partial pressure of each gas is initially one atm, what will happen?

Indicate True (T) or False (F) for each of the following:

1. A reaction will occur in which COCl2(g) is produced

2. Kp will decrease.

3. A reaction will occur in which CO is produced.

4. Q is less than K

. 5. The reaction is at equilibrium. No further reaction will occur.

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2.
Consider the following reaction where Kp = 2.74 at 1150 K.  

2SO3(g) 2SO2(g) + O2(g)  

If the three gases are mixed in a rigid container at 1150 K so that the partial pressure of each gas is initially one atm, what will happen?

Indicate True (T) or False (F) for each of the following:

___
T
F
1. A reaction will occur in which SO3(g) is produced.
___
T
F
2. Kp will increase.
___
T
F
3. A reaction will occur in which SO2 is consumed.
___
T
F
4. Qp is greater than Kp.
___
T
F
5. The reaction is at equilibrium. No further reaction will occur.