New answers tagged

1 vote

How can I systematically solve a system of non-linear equations using a standard graphing calculator?

Have you considered conversion of the set of nonlinear equations to an optimization problem? If we have set of equations: \begin{align} L_1 &= R_1\\ L_2 &= R_2\\ ..&.. \\ L_n &= R_n \...
  • 32.9k
1 vote

Why does the reaction of dissolution stop at an equilibrium point?

"Why does the reaction of dissolution stop at an equilibrium point?" It does not stop! There are two sides to a state of equilibrium: The forward reaction, e.g. a salt dissolving in water, $...
2 votes

Why can't the product of an acid reacting with water react with water itself and produce OH-?

I really like this question because it digs at wanting to understand what's going on beneath the equations you've been given to know why that equation works. Orthocresl answered it really well, but I ...
  • 21
8 votes
Accepted

Why can't the product of an acid reacting with water react with water itself and produce OH-?

It definitely does. Let's simplify it to a monoprotic acid (like acetic acid, $\ce{CH3COOH}$), which I'll just represent as $\ce{HA}$ for simplicity. In a solution of the acid, you will have all of ...
  • 68.8k
1 vote

How to determine the charge of amino acid at certain pH?

The change of $\mathrm{pH}$ from $+1$ to $+2$ does not change much in the main formula of alanine, which is and stays $\ce{H3\overset{+}{N}−(CH3)CH−COOH}$, up to $2.34$ which is the first $\mathrm{p}...
  • 24.5k
6 votes

How to determine the charge of amino acid at certain pH?

Behaviour of amino acids in water solution Amino acids exist in the solution in the form of zwitterions (molecules that contain an equal number of positively and negatively charged functional groups). ...
  • 516

Top 50 recent answers are included