Lab Assignment #4 Questions

One of the benefits of adding gypsum (CaSO4 2H2O) is that Ca ion will replace Na ion on the exchange complex.

MajaKrzic (talk)18:25, 3 March 2014

Hi, Maja, for question 4b, following the irrigation, because Na ions promote dispersion and colloids are far apart, so we just need to consider ESP to see which is most likely to disperse? Thanks!

YuediMa (talk)00:23, 4 March 2014

yes, that is correct. Of all info provided in this question, only ESP gives you relevant info re. sodium

MajaKrzic (talk)14:15, 4 March 2014
 

If Na is present in small amount in the exchange complex, is it still beneficial to replace Na with Ca? Or it is not necessary?

ChengKuang (talk)01:39, 4 March 2014

If a soil has a low conc. of sodium there is no need to replace it with calcium (or any other cation). The replacement would be beneficial, but it isn't necessary

MajaKrzic (talk)14:17, 4 March 2014