Positively charged hydrogen ion or hydronium ion

H+ ions is symbol of hydrogen ions It release when acid react with water
H+ ions are formed due to loss of electron by Hydrogen atom. Since, H- atom has a proton and an electron only, after loosing the only electron it remains a proton only. So H+ ion is basically a proton.
H+ ions means releasing of hydrogen ion This is occur when acid react with aqueous solution
When concentrated HCL is added into water it it formed H plus and cl- ion H plus iron is also conduct electricity
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