Test-exam 2

Voltmeter zn znso4aq crno33 under standard condition

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: cell. Voltmeter Zn ZnSO4(aq) Cr(NO3)3 () Under standard condition which of the following is true? a. The electrons flow from the cathode to the anode. b. The electrons flow from the zinc electrode to the chromium electrode.* c. The potassium ions in the salt bridge flow to the zinc cell. d. The chromium metal, Cr(s), is oxidized. e. The zinc metal, Zn(s), is reduced. Ans. a. Wrong. For Votaic cell electrons flows from anode to cathode. b. Correct. From the table, Zn2+ 2e- → Zn(s) -0.76V while Cr3+ + 3e- → Cr(s) -0.74V. Therefore, zinc direction should be switched and zinc is the anode. 2 c. Wrong. The zinc electrode produces more and more positive ions. To keep Votaic cell electrically neutral, the chloride ions in the salt bridge will have to move to the zinc cell, not potassium ions. d. Wrong. See explanation for a. e. Wrong. See explanation for a. 4. Solid sodium oxalate, ionic reaction is Na2C2O4 ( s) (FW = 133.998 g/mol) can be used as a primary standard for determining the concentration of potassium permanganate, KMnO4 (FW = 158.0...
View Full Document

Ask a homework question - tutors are online