chem 15 hw #3 - Tien Wei(Tom Lee SID 21846711 Chem 15 Lab...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Tien Wei (Tom) Lee SID: 21846711 Chem 15 Lab Lab Section 101 GSI: Jamie Kulp The ion-selective electrode used as soil analysis instrument in the Phoenix spacecraft measured solution concentration of the cations Ca2+, Mg2+, K+, NH4+, and Na+; the H+ ion (for pH); and the halide ions, Cl–, Br–, and I– contained in the northern plains of Mars. The Hofmeister anion ISE in Wet Chemistry Laboratory was initially used to monitor the nitrate concentration but was later changed to be used for perchlorate detection. Other electrodes Measured the total conductivity and oxidation-reduction potential, performed cyclic voltammetry, to detect soluble iron, and repeatedly measured halide concentration with chronopotentiometry. The space landers also used deployable BaCl2 crucibles to detect sulfate by titration using a Ba2+ ISE. Essentially, these ion-selective electrodes were used to measure the composition of the Martian surface, in particular, to detect and measure the specific ions each electrode is targets. The ISE was capable of doing this because it uses a
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/11/2012 for the course CHEMISTRY 15 taught by Professor Bordel during the Fall '11 term at Berkeley.

Page1 / 2

chem 15 hw #3 - Tien Wei(Tom Lee SID 21846711 Chem 15 Lab...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online