Mr. Johnson’s dinner table is 60 inches wide. How wide is his table in feet?

Calculate the equilibrium concentration of H 3 O H3O in a 0.20 M M solution of oxalic acid. Express your answer to two significa

Black_prince [1.1K]

Answer: The equilibrium concentration of $H_3O^+$ ion is $8.3064\times 10^{-2}M$

Explanation:

We are given:

Molarity of oxalic acid solution = 0.20 M

Oxalic acid $(H_2C_2O_4)$ is a weak acid and will dissociate 2 hydrogen ions.

The chemical equation for the first dissociation of oxalic acid follows:

$H_2C_2O_4(aq.)+H_2O\rightleftharpoons H_3O^+(aq.)+HC_2O_4^-(aq.)$

Initial: 0.20

At eqllm: 0.20-x x x

The expression of first equilibrium constant equation follows:

$Ka_1=\frac{[H_3O^+][HC_2O_4^{-}]}{[H_2C_2O_4]}$

We know that:

$Ka_1\text{ for }H_2C_2O_4=0.059$

Putting values in above equation, we get:

$0.059=\frac{x\times x}{(0.20-x)}\\\\x=-0.142,0.083$

Neglecting the negative value of 'x', because concentration cannot be negative.

So, equilibrium concentration of hydronium ion = x = 0.083 M

The chemical equation for the second dissociation of oxalic acid:

$HC_2O_4^-(aq.)+H_2O\rightarrow H_3O^+(aq.)+C_2O_4^{2-}(aq.)$

Initial: 0.083

At eqllm: 0.083-y 0.083+y y

The expression of second equilibrium constant equation follows:

$Ka_2=\frac{[H_3O^+][C_2O_4^{2-}]}{[HC_2O_4^-]}$

We know that:

$Ka_2\text{ for }H_2C_2O_4=6.4\times 10^{-5}$

Putting values in above equation, we get:

$6.4\times 10^{-5}=\frac{(0.083+y)\times y}{(0.083-y)}\\\\y=-0.083,0.0000639$

Neglecting the negative value of 'x', because concentration cannot be negative.

So, equilibrium concentration of hydronium ion = y = 0.0000639 M

Total concentration of hydronium ion = [x + y] = [0.083 + 0.0000639] = 0.0830639 M

Hence, the equilibrium concentration of $H_3O^+$ ion is $8.3064\times 10^{-2}M$

7 0

3 years ago

Sodium chloride (NaCI) is made from _____ of sodium (Na) and ___ of chlorine ( Ci)

astra-53 [7]

Sodium chloride is made from one sodium atom and one chlorine atom:

Sodium has a charge of +1, or just +.

Chlorine has a charge of -1, or just -.

These balance out.

6 0

3 years ago

Read 2 more answers

Combustion of methanol displayed formula???

Andrew [12]

Answer:

reee, here is your answer.

Explanation: CH3OH(l) + 3O2(g) rightarrow CO2(g) + 3H2O(g) CH3OH(l) + O2(g) rightarrow CO2(g) + 2H20(g) CH3OH(l) + 2O2(g) rightarrow 2CO2(g) + 4H20(g) 2CH3OH(l) + 3O2(g) rightarrow 2CO2(g) + 4H20(g) Correct Calculate Delta H degree rxn at 25 degree C.

6 0

3 years ago

Gasoline boils at a relatively low temperature (about 150°C). The kerosene is removed at around 200°C, followed by diesel oil at

asambeis [7]

Explanation:

The teacher is most likely talking about the fractional distillation process.

Fractional distillation: It is a separation technique used to separate different components of the given mixture on the basis of their difference in boiling points of the different components. The component with lowest boiling point will get separate out first from the mixture and the vapors formed from boiling are condensed in a separate container.

So, when the fractional distillation of mixture of oils and fuels is carried out gasoline will separate out first due to lower boiling temperature and then kerosene followed by diesel and others (fuels and oils).

6 0

3 years ago

Please help I have a test

natka813 [3]

Answer:

Pink- Lithium Salts or Lithium Nitrate (NO3), Yellow- Sodium Salts or Sodium Nitrate (NO3)

Explanation:

These chemicals (Sr, Ba, Cu, Ca, Na, Mg) are used because they create the colors for the firework. As you can see, the chemicals Nitrogen (N) and Oxygen (O) are combined with the color chemicals to make them combust.

The chart below explains the colorants used in firework creations:

Color= Compound

Red= strontium salts, lithium salts

lithium carbonate, Li2CO3 = red

strontium carbonate, SrCO3 = bright red

Orange= calcium salts

calcium chloride, CaCl2

calcium sulfate, CaSO4·xH2O, where x = 0,2,3,5

Gold= incandescence of iron (with carbon), charcoal, or lampblack

Yellow= sodium compounds

sodium nitrate, NaNO3

cryolite, Na3AlF6

Electric White= white-hot metal, such as magnesium or aluminum

barium oxide, BaO

Green= barium compounds + chlorine producer

barium chloride, BaCl+ = bright green

Blue= copper compounds + chlorine producer

copper acetoarsenite (Paris Green), Cu3As2O3Cu(C2H3O2)2 = blue

copper (I) chloride, CuCl = turquoise blue

Purple= mixture of strontium (red) and copper (blue) compounds

Silver= burning aluminum, titanium, or magnesium powder or flakes

I hope this answers the question you have! If not, I apologize.

8 0

3 years ago