No: Any aqueous solution with a pH value below 7 at standard temperature and pressure is acidic, the opposite of basic.
Limestone is made of calcium carbonate, which is a base when dissolved in water
Iron chloride is acidic because some of the water molecules in its hydration shell deprotonate. Sodium carbonate is basic because its the salt of a weak acid. Thus, some carbonate ions take protons from water, creating basic hydroxide ions.
At the simplest, definitional level, sodium carbonate is a basic salt because a solution of it in pure water has a pH value greater than 7. The underlying reason is that sodium hydroxide is a strong base, with complete ionization in water, but carbonic acid is only a weak acid with slight dissociation in water. Therefore, when a large concentration of carbonate ions is introduced into water by dissolving sodium carbonate in the water, most of the carbonate ions undergo at least the following reaction: CO3-2 + H2O -> HCO3-1 + OH-1. This makes the solution more basic.
basic
slightly basic
MgCO3 (Magnesium Carbonate) is a metal carbonate and reacts with an acid to produce salt + water + CO2. Thus, it is weakly basic.
Limestone is made of calcium carbonate, which is a base when dissolved in water
Iron chloride is acidic because some of the water molecules in its hydration shell deprotonate. Sodium carbonate is basic because its the salt of a weak acid. Thus, some carbonate ions take protons from water, creating basic hydroxide ions.
No. The carbonate ion is basic.
At the simplest, definitional level, sodium carbonate is a basic salt because a solution of it in pure water has a pH value greater than 7. The underlying reason is that sodium hydroxide is a strong base, with complete ionization in water, but carbonic acid is only a weak acid with slight dissociation in water. Therefore, when a large concentration of carbonate ions is introduced into water by dissolving sodium carbonate in the water, most of the carbonate ions undergo at least the following reaction: CO3-2 + H2O -> HCO3-1 + OH-1. This makes the solution more basic.
basic
slightly basic
Yes. Calcium carbonate is a weak base.
This statement is not true.
No it is basic.
Sodium carbonate solution is alkaline because of the carbonate ion. Sodium ions do not change the pH. However, carbonate, being the conjugate base of a weak acid (carbonic acid/hydrogen carbonate) does affect the pH. The carbonate ions can abstract a proton to form hydrogen carbonate, HCO3-. When the proton is abstracted from water, hydroxide ions form which results in a higher pH (more basic).
ZnCO3 is zinc carbonate, aka smithsonite, which is neither an acid nor a base, but rather a salt.