Recent content by phys1618

i read the links thank you for the info. However, is there any other way to perform an isolating caffeine organic lab experiment besides using methylene chloride?

what is a civet? is my answers correct though?

Homework Statement what are the types of methods to use to remove caffeine? Homework Equations The Attempt at a Solution column chromatography, distillation, Solid phase extraction and Tlc chromatography

use different temperature. The distance they travel is then used to calculate an Rf value which can be compared to known values to identify a substance. the 3 spots may or may not be identified. Can it be contaminated with an outside source, that's why there's 3 rather than 2?

ehhe I'm not goin to get mad. I appreciate your help! I truly don't know how to distinguish between two different compounds that had identical Rf values. I would do the experiemtn again? Can they be the same compounds or are closely related? Yes, the appearance of the spot would help me...

Homework Statement In detail, explain the theory behind the use of chromatography as a a.)separation technique. b.) identification technique. Homework Equations The Attempt at a Solution I know that chromatography can be used as a separation technique and also indetification...

Homework Statement (sin 3α/sin α) - (cos 3α/cosα) =2 Homework Equations The Attempt at a Solution I know for sin 2 α I would put 2 sinαcosα, so for 3α, do I just put 3sinαcosα? for cos 3α, I'm sort of clueless because there's 3 we can use for cosine, Then after that step, I...

Homework Statement cos(α − β)cos(α + β) = cos2α - sin2 β Homework Equations cos(α + β) = cos α cos β − sin α sin β cos(α − β) = cos α cos β + sin α sin β The Attempt at a Solution I worked out the LHS which makes it cos2α cos2β - sin2α sin2β=RHS Then, I'm stuck, however, i...

Homework Statement Is mitosis the same as cell division? Homework Equations The Attempt at a Solution I want to say yes because mitosis is a type of cell division and when you speak of mitosis, it's usually referred to cell division. However, mitosis doesn't include all of cell...

thank you so to explain my answer : HB + Na+ A- = B- + HA Since HB is a stronger acid, A- is a stronger base, stronger acid=weaker conj. base

so answer is yes

HB + A- = B- + HA strong acid + A- = B- + weak acid Since HB is a stronger acid, isn't A- a stronger base? stronger acid=weaker conj. base?

Homework Statement Acid HA has a pKa=20; acid HB has a pKa=10 a. which is the stronger acid? b. will an acid-base reaction with an equilibrium lying to the right take place if Na+ A- is added to HB? Explain your answer. Homework Equations The Attempt at a Solution I know that...

thank you

thank you