Determining An Equilibrium Constant Using Spectrophotometry

H hydrogen H+ hydrogen ion Li lithium Li + lithium ion Na sodium (natrium) Na + sodium ion K potassium (kalium) K+ potassium ion Rb rubidium Rb + rubidium ion Cs cesium Cs + cesium ion Be beryllium Be 2+ beryllium ion Mg magnesium Mg 2+ magnesium ion Ca calcium Ca 2+ calcium ion

Ion Channels and Receptors - MIT

Composite s tructure of voltage -gated K + channels Top panel: A backbone diagram of the ion -selectivity filter of KcsA P1–P5 correspond to five K +-binding sites that are numbered from the outside (top) The P0 site mentioned in the main text is not shown Each site is formed by eight oxygen atoms (red) that surround each K + ion (green

EDTA ) Ba(EDTA) K

Ba2+(aq) + EDTA4 (aq) Ba(EDTA)2 (aq) K = 7 7 × 10 The polyatomic ion C 10 H 12 N 2 O 8 4 is commonly abbreviated as EDTA4 The ion can form complexes with metal ions in aqueous solutions A complex of EDTA4 with Ba2+ ion forms according to the equation above

Ion Activity, Ion Association and Solubility

1 Ion activity • Review of general expressions • Activity coefficient calculations • Implementation in computer code 2 Ion pairing • Calculation of ion pairing • Implementation in computer code • Calculation of CaSO40 formation 3 Solubility • Saturation Index (SI) • Interpretation of SI results • Model calculations (Wateq4f

Table of Acids with Ka and pKa Values* CLAS

Pyridinium ion C5H4NH + C 5H4N 5 6 x 10-6 5 25 Citric (3) HC6H5O7 2-C 6H5O7 3-4 0 x 10-6 5 40 Carbonic (1) H2CO3 HCO3-4 3 x 10-7 6 37 Sulfurous (2) HSO4-SO42-1 02 x

Ch 11: EDTA Titrations

metal ion As seen in the fractional composition diagram, most EDTA is not Y4− below pH 10 37 The species HY3−, H2Y2−, and so on, predominate at lower pH From the deﬁnition αY4− = [Y4−]/[EDTA], we can express the concentration of Y4− as [Y4-]=α Y4-[EDTA] where [EDTA] is the total concentration of all unbound EDTA species Kf