In an investigation,
the volume of a
material is measured
as 80.0 cm3 and its
mass is measured
as 253 g.
Which
calculation of density
correctly uses the
precision rules:
3.1625 g/cm3,
3.163 g/cm3,
3.16 g/cm3,
3.2 g/cm3,
or 3 g/cm3?

The answer is d.potassium

According to arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. further, acid and base reacts to form salt and water.consider following example.hcl    +      h2o          →      cl-          +      h3o+here, hcl has donated a proton, hence it is an acid.now consider following reactionhcl      +      naoh            ↔      nacl      +        h2oin this reaction, hcl donates proton, hence it is acid. on other hand, naoh donates hydroxyl ion (i.e. hence it is a base.