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Lyrx [107]
2 years ago
14

10 ejemplos de disoluciones identificando el soluto y el solvente y el tipo de disolucion que corresponde

Chemistry
1 answer:
Keith_Richards [23]2 years ago
4 0

Answer:

hije51k 5jk45679349fjvokhffgpv9ü

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How many joules in total would be required to boil 11.8 g of water if I begin heating it at a temperature of 65.5 C ? ( two step
solong [7]
In this solution we will need two steps, 1) calculate the heat required to get water to the temp of 100 C and 2) find the latent heat of vapourization required. 

First, change the 11.8g to kg: = 0.0118kg
Equations: Q = mcT, Q=mL

c for water = 4186 J/(kg C)
L for water = 22.6 x 10^5 J/kg

1) Q = mcT
Q = 0.0118 kg x 4186 J/(kg C) x (100 C - 65.5 C)
Q = 1704.12 J

2) Q = mL
Q = 0.0118 kg x 22.6 x 10^5 
Q = 26668 J

Qf = 1704.12J + 26668J
Qf = 28372.12J

With sig figs: <u>2.84 x 10^4 J</u>
3 0
3 years ago
Unknown halogen X2 was added to each of two test tubes which contained aqueous NaCl and aqueous NaI, respectively. When hexane w
weeeeeb [17]

Answer:

Br_2

Explanation:

The compound X_2 is Br_2.

The reaction included are:

Br_2+NaCl--> No\ reaction  (because  bromine is less reactive than chlorine)

But , because of hexane the solution get dilute and its color changes to orange.

Now, NaI is added and we know Br is more reactive than I.

Therefore it replace it.

Reaction: Br_2+NaI-->NaBr+I_2

Purple color develop due to formation of Iodine.

7 0
3 years ago
11. Calculate the energy required to produce 12.00 mol of CI207 on the basis of the
Ber [7]

Answer: 780 kcal are required to produce 12.00 mol of Cl_2O_7

Explanation:

Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and written along with reactants.

The balanced chemical reaction is:

2Cl_2(g)+7O_2(g)+130kcal\rightarrow 2Cl_2O_7(g)

According to stoichiometry :

2 moles of Cl_2O_7 are produced by absorption of energy = 130 kcal

Thus 12.00 moles of Cl_2O_7 are produced by absorption of energy = \frac{130}{2}\times 12.00=780kcal

Thus 780 kcal are required to produce 12.00 mol of Cl_2O_7

4 0
3 years ago
The NH₄⁺ ion forms acidic solutions, and the CH₃COO⁻ ion forms basic solutions. However, a solution of ammonium acetate is almos
tigry1 [53]

Not always ammonium salts of weak acids form neutral solutions.

When formic acid reacts with ammonia, ammonium formate is produced:

HCO2H + NH3 ---->  NH4HCO2

You already know that the weak conjugate bases of NH3 and HCO2H are NH4+ and HCO2, respectively.

How can the pH of the solution be calculated if the salt's anion causes the pH to rise and the salt's cation causes it to fall? The relative intensities of the basic anion and the acidic cation hold the key to the solution.

As was already established, formate is a weak base and will create hydroxide ions in water, whereas ammonium is a weak acid and will make hydronium ions in water.

NH4⁺ + H2O -----> NH3 + H3O⁺

HCO2⁻ + H2O ----->  HCO2H + OH⁻

Since the acid ionization of NH4+ is more favored than the base ionization of HCO2-, the solution will be acidic.

To learn more about ammonium salts:

brainly.com/question/10874844

#SPJ4

6 0
1 year ago
What is the pH of a 0.1 M phosphate buffer (pKa = 6.86) that contains equal amounts of acid and conjugate base?
Anvisha [2.4K]

Answer : The pH of a 0.1 M phosphate buffer is, 6.86

Explanation : Given,

pK_a=6.86

Concentration of acid = 0.1 M

Concentration of conjugate base (salt) = 0.1 M

Now we have to calculate the pH of buffer.

Using Henderson Hesselbach equation :

pH=pK_a+\log \frac{[Salt]}{[Acid]}

Now put all the given values in this expression, we get:

pH=6.86+\log (\frac{0.1}{0.1})

pH=6.86

Therefore, the pH of a 0.1 M phosphate buffer is, 6.86

4 0
3 years ago
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