The Ka for hydrofluoric acid is 7.2 x 10-4. This means that HF is

a weak acid

neutral in water solution

able to react with HCl

a strong acid

Why does a red shoe appear red in daylight

What layer of the atmosphere is directly above the troposphere?

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?