Yvonne Shuen Lann Choo

7 Questions 9 Answers 0 Followers

Questions related from Yvonne Shuen Lann Choo

Any tips and tricks to prevent bubbles from being trapped in polymer film during membrane formation via immersion precipitation?

Steps involved: 1. Dissolving polymer into THF 2. Casting on an FEP sheet support 3. Immersing into water bath I noticed most bubbles formed during casting and immersing into a water bath. Did...

07 July 2017 6,457 7 View

Will the same organic compound when repeatedly synthesized (via the same reaction pathway) gives different colours?

Has anyone experienced this before?

01 January 2015 2,171 0 View

Why does the level of phenobarbital spiked in blood appear to be lower than the actual spiked amount when being screened by ELISA?

5ppb of phenobarbital have been spiked into blank blood. This have been replicated by 10 times. However, ELISA results show that all 10 of the replicates contains LESS than 5ppb (average of...

07 July 2013 1,544 1 View

Will the formation of semicarbazone from an unknown (suspected to be a ketone) be long, or has it been falsely analysed?

In an undergraduate organic experiment, we are required to identify the functional group present via solubility tests (with H2O, HCl, NaOH and NaHCO3) and Classification Tests (Brady's, Tollen's,...

03 March 2013 9,526 7 View

Is it possible for the number of theoretical plates (N) of a fractional distillation column (length 13.3cm) to be less than 1 plate?

In an experiment, we are required to fractionally distill a 1:1 mixture of acetone and ethanol. The first 5mL of the distillate is collected for GC. From the GC data obtained which shows the area...

03 March 2013 6,070 2 View

How did you know that you're suitable to do research in a particular field of Chemistry (organic, inorganic, analytical etc)?

I am a second year chemistry undergraduate and I am currently having problems choosing for the field of Chemistry (organic, inorganic, physical, analytical or industrial chemistry) that I would...

02 February 2013 9,338 15 View

Can bis(triphenylphosphine)copper(I) borohydride, (Ph3P)2CuBH4 be synthesized with copper(II) sulphate pentahydrate, CuSO4.5H2O?

Synthesis of Bis(triphenylphosphine)copper(I) borohydride, (Ph3P)2CuBH4

12 December 2012 7,465 16 View