A student dissolved some crystals of a salt in water.
The student added sodium hydroxide solution to the salt solution.
The student added sodium hydroxide solution until it was in excess.
Describe an additional test the student could do that would prove the salt contains calcium ions.

increased stability in the completion of fluorine's outer shell.

if the temperature drops and becomes cool

then the atmosphere can be freezing as the water vapor in the air is at maximum (100%) and can be severely cold

also can be snowing lightly as the moisture in the air will start to solidify

and btw this is not chemistry but