A simple problem that demonstrates the relations between mass, volume and density.
The density, in g/cm cubed, of Pt if 100.0 g occupies 4.67ml.
I need a little nudge to get me started: Determine the weight in grams of sodium dihydrogen phosphate (M.W.138.01) and disodium hydrogen phosphate (M.W 141.98) needed to preparte 1L if a standard buffer at pH 7.00 with a total phosphate concentration of 0.100M. Okay I know that the pKa is going to be 6.86. I am therefore ...continues
An unknown compound X, is thought to have a carboxyl group with a pka of 2.0 and another ionizable group with a pka between 5 and 8. When 75 ml of 0.1 M NaOH was added to 100 ml of a 0.1 m solution of X at pH 2.0, the pH increased to 6.72.Calculate the pka of the second ionizable group of X. I tried to solve this using the H ...continues
I am looking for a chemist that can develop dye's, if you have exp doing dye's this project may be for you, please contact me so we can discuss further, contact me via email, with your number. Regards Michael Paulson jkremodel@aol.com
Calculate the pH upon diluting 2ml of 2 N HCL to a final volume of 100 ml? Calcuate the pH upon addition of 0.0075 mole of solid NaOH to 100 ml of a 0.1 M solution of acetic acid (pKa=4.7)? If equal molar amounts of Na2HPO4 and NaJpo4 are mixed in water, calcuate the resulting pH. The pKas of phosphoric acid are 2.1, 7.2, ...continues
Titration plots of Ala and His
1. (A) Assume you have a solution containing 0.1 mol of Ala adjusted to pH = 0.5 with HCl. You begin adding 1.0 M NaOH. Plot (do not sketch) the resulting titration curve (pH vs. moles NaOH added) showing all inflection points. Show your calculations and be sure to state your assumptions. (B) Plot a similar titration curve ...continues
Why the colour of blood is RED?
The chemical reasons for the red colour of blood are given in this solution in a simple layman's language.
