WILL MARK BRAINLIEST IF CORRECT!! A buffer is made using HCO2Na. Which other substance should the buffer contain?

HCO2Li

HCO2H

NaNO3

HCl

Thank you in advance!

Calculate the h3o+ concentration in a solution of acetic acid if the concentration of molecular acetic acid present at equilibrium is 9.97x10^-3 m and k for the dissociation is 1.86x10^-5. ch3cooh(aq)+h2o(> h3o^+(aq)+ch3coo^-(aq)

1) these are barrel shaped microtubules in most animal cells, that organize the spindles during cell division

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?