Comments

Post a Comment

Popular posts from this blog

How to determine the order of a reaction by the initial rates method?

How to determine the order of a reaction? Determining the form of the Rate Law (Order of Reaction) by the method of Initial Rates Home > Rate of a Chemical Reaction - Chemical Kinetics > Rates of Chemical Reactions and the Collision Model > How to determine the order of a reaction by the initial rates method?   How to determine the order of a reaction by the initial rates method?   A rate law is an expression which shows how the rate of a reaction depends on the concentrations of reactants. For the decomposition of NO 2 we can write: 2NO 2 (g) → 2NO(g) + O 2 (g)  Rate = k [NO 2 ] n      (Rate Law) k is the rate constant and n is the order of reaction (n can be positive or negative, integer or fraction) Both k and n must be determined experimentally. For the general reaction: aA + bB → cC + dD   (1) the rate law is given by:   Rate = k. [A] m [B] n     (2)   There are two types of rate laws: The differential rat...
Read more

Self-ionization of water - Autoionization of water - The ion product of water (kw)

Image
Self-ionization of water - Autoionization of water - The ion product of water (kw) Home > Weak Acids and Bases – Calculate the pH of a weak acid (a general equation) > Solving Weak Acid and Weak Base pH problems > Weak Acid Weak Base pH calculation solved example > Weak Acid Weak Base pH calculation solved example > Cubic Equation Calculator for Weak Acid-Base Equilibria > Polyprotic Acids / pH Calculation > Self-ionization of water - Autoionization of water - The ion product of water (kw) Self-ionization of water - Autoionization of water - The ion product of water (kw) A water molecule can act as an acid and as a base according to: In the above reaction – autoionization of water - one water molecule acts as an acid donating a proton to the other water molecule that acts as a base – proton acceptor. From the equation we see that for every hydronium ion H 3 O + that is formed a hydroxyl ion...
Read more

Analytical Chemistry - Calibration

Analytical Chemistry - Calibration Home > Analytical Chemistry > Calibration CALIBRATION What is calibration? Calibrated instruments|Analytical Chemistry Calibrating a pH meter using buffers Quantitative Analysis by Atomic Absorption Performance Verification of Analytical Balances according to ISO/IEC 17025 Calibration and Outliers - Statistical Analysis Calibration of an instrument in Analytical Chemistry is the operation that determines the functional relationship between measured values (signal intensities S at certain signal positions zi) and analytical quantities characterizing types of analytes qi and their amount ( content , concentration ) n. Calibration includes the selection of the model (its functional form), the estimation of the model parameters as well as the errors, and their validation. During calibration , the in...
Read more