Answer:
they start bubbling and if you don't watch it the water can boil out and evaporate into the air.
Explanation:
Dissociation reaction of calcium hydroxide can be represented as follows:
<span>Ca(OH)2 (s) ⇄ Ca2+(aq) + 2OH-(aq)
</span>
The solubility product of Ca(OH)2 is mathematically expressed as
Ksp = [Ca2+] [OH-]^2
Given: Ksp = <span>4.68 x 10-6
Now, we know that for aqueous system, pH + pOH = 14
and pOH = -log(OH-)
Thus, [OH-] = </span><span>10^(pH - 14)
</span>∴ Ksp = [Ca2+] [10^(pH - 14)]^2 = [Ca2+] [10^(2.pH - 28)]
∴ [Ca2+] = Ksp/10^(2.pH - 28)
= Ksp 10^(28 - 2.pH)
Now, at pH = 4
[Ca2+] = Ksp 10^(28 - 2.pH)
= (4.68 x 10-6) 10^(28 - 2X4)
= 4.68 X 10^14 mol/dm3
At pH = 7,
[Ca2+] = Ksp 10^(28 - 2.pH)
= (4.68 x 10-6) 10^(28 - 2X7)
= 4.68 X 10^8 mol/dm3
At pH = 9
[Ca2+] = Ksp 10^(28 - 2.pH)
= (4.68 x 10-6) 10^(28 - 2X9)
= 4.68 X 10^4 mol/dm3
Answer:
Following is molar solubility of calcium hydroxide at different pH
at pH 4 = 4.68 X 10^14 mol/dm3
at pH 7 = 4.68 X 10^8 mol/dm3
at pH 9 = 4.68 X 10^4 mol/dm3
40/20 = 2 mol of HF
Sn to HF ratio is 1:2 so divide the 2 mol of HF by 2 to get 1 mol of Sn.
It mostly because they're so reactive and if they were in their pure form and touched water they would have a very violent reaction. They also want to be more stable so they look for more electrons and quickly bond.
Answer:
The theory for the origin and evolution of the universe is the Big Bang model, which states that the universe began as an incredibly hot, dense point roughly 13.7 billion years ago.
