its for a element project that i have
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It means that there are 15 moles (a unit of measure) of HNO3 in one of that substance. M basically just means moles of that solute per liter.
Many things react with lead (Pb 2+) such as I-, Cl-, O 2- and many other anions.
Pb 4+ is also common and it reacts with hydroxide, oxygen, amongst others.
Many things react with lead (Pb 2+) such as I-, Cl-, O 2- and many other anions.
Pb 4+ is also common and it reacts with hydroxide, oxygen, amongst others.
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M = molarity. Meaning 15 moles of HNO3 (nitric acid) was dissolved with water making a 1 L solution. A lot of things react with lead, if you could be more specific, that would help.