Consider these compounds: A. Fe2S3 B. Zn3(PO4)2 C. CrPO4 D. CaCO3 Complete the following statements by entering the letter corresponding to the correct compound. Without doing any calculations it is possible to determine that cobalt(II) carbonate is more soluble than , and cobalt(II) carbonate is less soluble than . It is not possible to determine whether cobalt(II) carbonate is more or less soluble than by simply comparing Ksp values.

See explanation

Explanation:

Cobalt II carbonate is more soluble than iron III sulphide, Zn3(PO4)2 and CrPO4

Cobalt II carbonate is less soluble than calcium carbonate.

The ksp of the compounds were compared and this is the order of solubility as shown above.

Ksp shows the degree of solubility of an ionic compound. The lower the ksp, the lesser the solubility of the compound. Compounds with very low ksp are normally termed 'insoluble' in 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"