I think that it is half are required to react with 40 g of HF.
Answer:
Has size and magnitude whereas a scalar quantity has only size
Answer:
An another result of climate change is the increasing in the frequency of high intensity rainfall events,which increase the regional water damage events.If the precipitation volume decreases in summer time and increases in winter time,then it will be lower infiltration and more runoffs.
Answer : The concentrations of hydroxide and hydronium ions in a solution with a pH of 10.2 are,
and
respectively.
Explanation : Given,
pH = 10.2
pH : It is defined as the negative logarithm of the hydrogen ion concentration.
First we have to calculate the hydrogen ion concentration ![(H^+)](https://tex.z-dn.net/?f=%28H%5E%2B%29)
![pH=-\log [H^+]](https://tex.z-dn.net/?f=pH%3D-%5Clog%20%5BH%5E%2B%5D)
Now put the value of pH in this formula, we get the hydrogen ion concentration.
![10.2=-\log [H^+]](https://tex.z-dn.net/?f=10.2%3D-%5Clog%20%5BH%5E%2B%5D)
![[H^+]=6.3\times 10^{-11}](https://tex.z-dn.net/?f=%5BH%5E%2B%5D%3D6.3%5Ctimes%2010%5E%7B-11%7D)
Now we have to calculate the pOH of the solution.
![pH+pOH=14](https://tex.z-dn.net/?f=pH%2BpOH%3D14)
Now put the value of pH, we get the value of pOH.
![10.2+pOH=14](https://tex.z-dn.net/?f=10.2%2BpOH%3D14)
![pOH=14-10.2](https://tex.z-dn.net/?f=pOH%3D14-10.2)
![pOH=3.8](https://tex.z-dn.net/?f=pOH%3D3.8)
Now we have to calculate the hydroxide ion concentration ![(OH^-)](https://tex.z-dn.net/?f=%28OH%5E-%29)
![pOH=-\log [OH^-]](https://tex.z-dn.net/?f=pOH%3D-%5Clog%20%5BOH%5E-%5D)
Now put the value of pOH in this formula, we get the hydroxide ion concentration.
![3.8=-\log [OH^-]](https://tex.z-dn.net/?f=3.8%3D-%5Clog%20%5BOH%5E-%5D)
![[OH^-]=1.58\times 10^{-4}](https://tex.z-dn.net/?f=%5BOH%5E-%5D%3D1.58%5Ctimes%2010%5E%7B-4%7D)
Therefore, the concentrations of hydroxide and hydronium ions in a solution with a pH of 10.2 are,
and
respectively.