What precipitate is most likely formed from a solution containing ca2+, na+, oh−, and co2−3. what precipitate is most likely formed from a solution containing , , , and . naoh caco3 na2co3 ca(oh)2?

The solution contains four ions

Ca2+, Na+, OH−, and CO3^-2

so there are following four combinations are possible

NaOH : this is highly soluble in water so will not form precipitate

Ca(OH)2: this is highly soluble in water so will not form precipitate

Na2CO3: again soluble in water so will not form precipitate

CaCO3 : this is not soluble in water (it has low solubility product) so this will form precipitate most likely

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.

i think it's letter a.