1. A solution is made by mixing 50mL of 2.0M K2HPO4 and 25mL of 2.0M KH2PO4. The solution is diluted to a final volume of 200mL. what is the pH of the final solution

The pH of the final solution is 7.15

Explanation:

50 mL of 2.0 M of and 25 mL of 2.0 M of were mixed to make a solution

Final volume of the solution after dilution = 200 mL

Final concentration of

Final concentration of

We use Hasselbach- Henderson equation:

Substituting the values:

Therfore,  the pH of the final solution is 7.15

c, liquids evaporate, creating a gas

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied