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25.02.2020 •
Chemistry
A 0.4158-g sample of primary-standard was treated with 45.00 mL of dilute perchloric acid. The solution was boiled to remove , following which the excess was back-titrated with 9.85 mL of dilute . In a separate experiment, it was established that 26.02 mL of the neutralized the in a 25.00-mL portion. Calculate the molarities of the and .
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Ответ:
3+
Explanation:
Ignore neutrons.
Protons are positive and electrons are negative. To find a charge, it is protons minus electrons. In this atom, there are 21 protons and 18 electrons
21-18=3
Positive 3