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mr Goodwill [35]
3 years ago
13

Which of the following is a basic solution? HCl dissolved in water b. household ammonia c. vinegar d. pure water

Chemistry
1 answer:
PSYCHO15rus [73]3 years ago
7 0

Answer:

B. Household ammonia.

Explanation:

NH₃ is a base, so the solution always will be basic.

NH₃ takes the proton from the water. In conclusion we have free OH⁻ in medium, that's why the solution is basic.

NH₃ + H₂O → NH₄⁺  +  OH⁻

- HCl + H₂O → H₃O⁺  + Cl⁻

This reaction makes an acid solution, cause the H₃O⁺

- Vinegar is a compound made of acetic acid.

CH₃COOH  + H₂O  ⇄  H₃O⁺  +  CH₃COO⁻

This reaction also makes an acid solution, cause the H₃O⁺

- Pure water makes neutral solution. It is not acid, neither basic.

2H₂O ⇄  H₃O⁺  +  OH⁻

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2 years ago
Calcium carbide reacts with water to produce acetylene gas according to the following equation: CaC2(s) + 2H2O(l)C2H2(g) + Ca(OH
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Answer : The number of moles of CaC_2 reacted was, 0.214 moles.

Explanation :

First we have to calculate the mole of C_2H_2 gas.

Using ideal gas equation:

PV=nRT

where,

P = Pressure of C_2H_2 gas = 748 mmHg - 23.8 mHg = 724.2 mmHg = 0.953 atm   (1 atm = 760 mmHg)

V = Volume of C_2H_2 gas = 5.50 L

n = number of moles C_2H_2 = ?

R = Gas constant = 0.0821L.atm/mol.K

T = Temperature of C_2H_2 gas = 25^oC=273+25=298K

Putting values in above equation, we get:

0.953atm\times 5.50L=n\times (0.0821L.atm/mol.K)\times 298K

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Now we have to calculate the moles of CaC_2

The balanced chemical reaction is:

CaC_2(s)+2H_2O(l)\rightarrow C_2H_2(g)+Ca(OH)_2(aq)

From the balanced chemical reaction we conclude that,

As, 1 mole of C_2H_2 gas produced from 1 mole of CaC_2

So, 0.214 mole of C_2H_2 gas produced from 0.214 mole of CaC_2

Therefore, the number of moles of CaC_2 reacted was, 0.214 moles.

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