Living in an intimate relationship is very difficult for most people but very pleasurable and rewarding. Continue reading Being together
How many pints of each 2 percent and 7 percent acid solutions must be mixed to obtain 50 pints of a 5 percent solution? A Video response to the question from Socratic.org. File can be downloaded here (Dropbox Folder). Related Concentration Picket fence 1 Picket fence 2 Learn ChemE Continue reading Determining Mixing Volumes
This is a video response to a question from Socratic.org: http://socratic.org/questions/how-does-linear-regression-work-in-excel-2013 You can download the xlsx workbook here (Dropbox Folder) Continue reading Boiling point of alkanes
Weekly challenge from King’s college mathematics school can be viewed here. Chemistry challenge from Cambridge University can be viewed here. 2014 UK Chemistry olympiad can be viewed here. Continue reading Challenge ?
How winged creatures play a vital role in pollination. Continue reading Wings of Life
Matter exhibits chemistry. Chemistry is the study of atoms and molecules, their interactions with each other as well as the properties that arise from this interplay. Chemistry is all around us, in you, in me and in all the products which are on display on the shelves of a super market. Often people associate chemists with Jekyll and Hyde, or Frankenstein. Not all chemicals are bad (see Natural … Continue reading Chemistry Outreach
If 525 mL of 0.80 M HCl solution is neutralized with 315 mL of Sr(OH)2 solution what is the molarity of the Sr(OH)2? The molarity of Sr(OH)2 is 0.67 M Acids and Bases neutralize each other. Strontium hydroxide will neutralize Hydrochloric acid to produce a salt and water. The reaction will be Sr(OH)2 +2HCl ——> SrCl2 + 2H2O. Volume of Strontium Hydroxide is 315 mL Volume of Hydrochloric acid is 525 mL … Continue reading A titration problem
I posted this answer to http://www.socratic.org. Titration is a cost effective and an easy analytic method to deduce the exact concentration of a solution. Titration is easiest of all the analytic methods available to find out the exact concentration of a solution. It is quite simple as all we need is a burette, a pipette, and a suitable indicator, in case the end point is … Continue reading Why is titration used when standardizing a solution?
In my AS level chemistry class, students study the disproportionation reaction of chlorine with alkali. In this reaction chlorine gets oxidized and reduced. While studying this topic one of the students asked how chlorine actually kills microbes. This news article published by the British journal Nature in 2008 responds to his question: …Now, researchers have found that bleach can kill bacteria by attacking proteins, quickly destroying … Continue reading Antimicrobial action of bleach