6A.21

Moderators: Chem_Mod, Chem_Admin

nshahwan 1L
Posts: 100
Joined: Fri Aug 30, 2019 12:18 am

6A.21

Postby nshahwan 1L » Thu Jan 23, 2020 6:51 pm

6A.21 The value of K w for water at body temperature (37 °C) is 2 .1 × 10 − 14 . (a) What is the molar concentration of H 3 O + ions at 37 °C? (b) What is the molar concentration of OH − in neutral water at 37 °C?

I am confused on what should be the difference for part a vs part b?

Zoe Gleason 4F
Posts: 51
Joined: Tue Jul 23, 2019 12:15 am

Re: 6A.21

Postby Zoe Gleason 4F » Thu Jan 23, 2020 6:56 pm

The correct values for a and b will be the same, because water is neutral (pH 7). The amount of H+ and OH- will be equivalent, so Ka=Kb and Kw=Ka*Kb.

Ryan Yee 1J
Posts: 101
Joined: Sat Aug 17, 2019 12:16 am

Re: 6A.21

Postby Ryan Yee 1J » Thu Jan 23, 2020 7:26 pm

There isn't a difference, but because the Kw given is in a different temperature, the concentration of both hydronium and hydroxide should be equal so take the square root of 2.1*10^-14 and that both of the concentrations should be equal to 1.4*10^-7


Return to “Equilibrium Constants & Calculating Concentrations”

Who is online

Users browsing this forum: No registered users and 2 guests