The figure below represents the results of adding a strong acid to a saturated solution of an ionic compound.Which of the following could be the ionic compound? 
Definitions:
Cashier's Check
A check issued by a bank, drawn from its own funds and signed by a cashier, considered very secure as it guarantees the available amount of cash.
Paying
The act of giving money, goods, or other forms of value in exchange for an item, service, or to fulfill an obligation.
Debt
An amount of money borrowed by one party from another, often with the condition of repayment with additional interest.
Promissory Note
A written, legally binding promise to pay a specified sum of money to a designated party on demand or at a defined future date.
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