Answer:
wait a min you dont know the rock cycle?
Explanation:
PH is the test of acidity or basicity of a solution. it follows the formula:
pH = pKa + log [salt] / [acid] where NaF is the salt and HF is the acid in this case.
By literature, Ka of HF is 3.5*10^-4
<span>pKa= -log(Ka)=</span><span> 3.46 </span>
<span>pH = pKa + log [NaF / [HF] </span>
4.05 = 3.46 + log [NaF / [HF]
log [NaF / [HF]<span> = 0.59
</span>
[NaF / [HF] = 3.89
120o.
BCl3 Molecular Geometry And Bond Angles
If we look at the structure, BCl3 molecular geometry is trigonal planar. The bond angle is 120o.
(120o means 120 degree)
A.) The reaction is Exothermic
Burning and other changes in matter do not destroy matter. The mass of matter is always the same before and after the changes occur. The law of conservation of mass states that matter cannot be created or destroyed