When calcium carbonate (CaCO3) is dissolved in water(H2O) , what happens? Group of answer choices

When CaCO3 is dissolved in water, it dissociated to give Ca2+ as well as CO3 2-. The CO3 2- will eventually gains two protons from water and forms a very weak Carbonic Acid (H2CO3). This acid is highly unstable and quickly dissociated to form Water (H2O) as well as Carbon Di-Oxide (CO2). The CO2 is evolved out in the form of bubble from water.

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.