Nh3–nh4cl is a/an that regulate the ph of a system. a. base b. buffer c. acid d. neutral solution

NH3–NH4Cl is a/an Buffer that helps regulate the pH of a system.

A buffer solution ( pH buffer or hydrogen ion buffer) is an aqueous solution consisting of a mixture of a weak acid and its salt formed from conjugate base, or weak base and its salt formed from conjugate acid.

Acidic Buffer : Consisting of a mixture of a weak acid and its salt formed from conjugate base.

Basic Buffer : Consisting of a mixture of a weak base and its salt formed from conjugate acid.

The given solution is NH3-NH4Cl is Basic buffer which is composed of weak base(NH3 ammonia) and a salt(NH4Cl ammonium chloride) formed from its conjugate acid(HCl hydrochloric acid).

composed of weak base and its salt and is considered as Basic Buffer.

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o