Identification of Anions and Cations

What is a cation's charge?

• positive

• negative

• neutral

• depends on the element

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is an anion's charge?

• positive

• negative

• neutral

• depends on the element's charge

When excess aqueous ammonia was added to an unknown sample, this was observed. Which cation is present?

• Cu²⁺

• Zn²⁺

• Ca²⁺

• Fe²⁺

When dilute acid was added to an unknown sample, bubbles were observed. Which anion is present?

• ammonium ion

• carbonate ion

• nitrate ion

• sulfate ion

When dilute nitric acid, followed by silver nitrate solution was added to an unknown sample, a white precipitate was observed. Which anion is present?

• chloride ion

• carbonate ion

• nitrate ion

• sulfate ion

When dilute nitric acid, followed by barium nitrate solution was added to an unknown sample, a white precipitate was observed. Which anion is present?

• chloride ion

• carbonate ion

• nitrate ion

• sulfate ion

NaOH is added to an unknown solution. A blue precipitate forms. The formula of the ion is:

• Fe

• Fe3+

• Fe2+

• Cu2+

Tags

NGSS.HS-PS1-1

Which of the following could also be used as a reagent for the Fe⁺³ test?

• NaSCN

• KCl

• NaCl

• NaOH

The most obvious was to determine the presence of Pb²⁺ ions is

• A flame test

• Adding AgNO₃

• Adding KI

• Adding BaSO₄

A flame test is conducted and a brick red colour is observed. What is the cation present

• Cu²⁺

• Ca²⁺

• Ag⁺

• Mg²⁺