Which of the following sets contains a substance that could not be used as an acid-base indicator? a. set 1: a weak acid b. set 2: a weak base c. set 3: a weak acid and a weak base d. set 4: a weak acid and a strong base

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.

Answer asap need to be answered by wednesday morning explain how a buffer works, using an ethanoic acid / sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.

What does a numerical subscript following an element in a chemical formula mean?