Which of the following is a base? AgO Ca(OH)2 HF NaCl
2 answers:
<u>Answer:</u> The correct answer is
<u>Explanation:</u>
A base is defined as the substance which looses hydroxide ions when dissolved in water.
An acid is defined as the substance which looses hydrogen ions when dissolved in water.
From the given options:
AgO and NaCl are the salts. Both are ionic salts which are formed from the reaction of a metal and an non-metal.
HF is an acid because it released ions when dissolved in water. The equation for the ionization of HF follows:
is a base because it released
ions when dissolved in water. The equation for the ionization of
follows:
Hence, the correct answer is
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Answer:
Brown color of the solution decreases
Explanation:
is brown in color whereas
is colorless.
Equilibrium reaction between and
is as follows:
As per the Le Chatelier's principle, if pressure of a equilibrium is increased, the equilibrium will shift in the direction having fewer no. of moles of gases.
In the given equilibrium, side has more no. of moles. So on increasing pressure, equilibrium will shift towards the side of
or more formation of
will take place.
Therefore, more will decompose that will decrease the brown color of the solution as
is colorless.
Answer: Thus ∆H, in kJ/mol, for the dissolution of MgSO₄ is -66.7 kJ
Explanation:
To calculate the entalpy, we use the equation:
where,
q = heat absorbed by water = ?
m = mass of water =
c = heat capacity of water = 4.186 J/g°C
= change in temperature =
Sign convention of heat:
When heat is absorbed, the sign of heat is taken to be positive and when heat is released, the sign of heat is taken to be negative.
The heat absorbed by water will be equal to heat released by
To calculate the number of moles, we use the equation:
Given mass = 5.11 g
Molar mass = 120 g/mol
Putting values in above equation, we get:
0.042 moles of releases = 2.8033 kJ
1 mole of releases =
Thus ∆H, in kJ/mol, for the dissolution of MgSO₄ is -66.7 kJ