Heeeeeelpp please (1 Viewer)

[sharoooooo]

pls help
why is it those answers? explain pleease

thank you

 

[rand_althor]

 

[rand_althor]

17.

• Alkanes: dispersion forces
• Alkanols: dispersion forces, polar hydroxyl group which allows for the formation of hydrogen bonds
• Alkanoic acids: dispersion forces, polar hydroxyl group and carboxyl group allowing for more hydrogen bond formation than alkanols

Since hydrogen bonds are stronger than dispersion forces, alkanes will have lower BP than alkanols which will have a lower BP than alkanoic acids (for corresponding amounts of carbons).

 

[sharoooooo]

i understand the maths and the formulas, but i still dont understand why we need to calculate the HCl?
since its in excess, it doesnt get reacted with. so why do we need to calculate this?

 

[rand_althor]

since its in excess, it doesnt get reacted with. so why do we need to calculate this?

That is exactly why! It doesn't react, so it remains in the reaction vessel. The other products (NaCl, H2O) are neutral, so they don't affect the pH. Thus, the remaining HCl is the only chemical changing the pH from 7.

 

[sharoooooo]

That is exactly why! It doesn't react, so it remains in the reaction vessel. The other products (NaCl, H2O) are neutral, so they don't affect the pH. Thus, the remaining HCl is the only chemical changing the pH from 7.

Ooooooohh i see
Thanks!!