Answer:
D H2PO4– + HPO42–
Explanation:
The acid dissociation constant for
are
respectively.



The reason while option D is the best answer is that, the value of pKa for both
lies on either side of the desired pH of the buffer. This implies that one is slightly over and the other is slightly under.
Using Henderson-Hasselbach equation:

Answer:
Follows are the solution to this question:
Explanation:
In this question, the given problem is used for secure accessing, drinkable water anywhere helps to solve personal filtered water. There are also both inexpensive and easy to access. Its components used mostly for everyone's manufacturing are long-lasting. Instead of just endangering users, those who protect the other, are the potential benefits to overall outweigh the potential.
Work is done when force is applied to an object and the object moved from one its distance ( one place to another )
so Work = Force * Distance
if force is 300N and distance is 100m
then Work = 300 * 100 Nm( newton meter) = 30000J
( Joule = newton meter)
I think the answer is yes