Based on the solubility rules, the following salts are water-soluble EXCEPT

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â 6. Using the solubility rules table, predict whether each of the following salts is soluble in water or not.

Na₃PO₄

CaCO₃

K₂S

Ca(NO₃)₂

PbCl₂

NaOH

(General rules of solubility)
Experimentally observed facts have led to the establishment ofrules used to predict the solubility of common compounds in water.The rules can be stated as follows:
Compounds that contain , , , and are always soluble with noparticular exceptions. Similarly, compounds that contain and arealways soluble.
The halides , , and form soluble salts with all the possiblecations except for , , and .
All the compounds that contain will be soluble except for compoundsthat have , , , and .
All the compounds that contain will be insoluble except for thosecompounds that pair with the alkali metal cations, , , , and.
All the compounds that contain or will be insoluble except forthose compounds that pair with the alkali metal cations and .
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If you carry out the reaction between table salt () and copper(II)sulfate () in of water, the salt copper(II) sulfate will behavesimilarly to the salts given in the tab named Slightly SolubleSalts.
Enter the formula for the precipitate, without the phase, that willbe formed. If no precipitate is formed, simply type "noreaction" inthe answer box.

Express your answer as a chemical formula.

Order the following slightly soluble salts by increasing solubility in water,