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The pH scale:
The equation: pKw=14.00=pH+pOH is obtained by taking the negative logarithm to the base 10 of the autoprotolysis equation, where
In general pX denotes -log10 of any given variable X, so that an increase in X results in a decrease in pX. This equation applies in all aqueous solutions. It allows the definition of the pH scale for water acidity from the pH of a solution, pOH ions can always be found from this equation, and the balance of these terms determines the water acidity. For example, when pH=7, then pOH=7 and the water solution is neutral (ph=7), as the activities of both H3O+ and of OH- are equal at 10-7. When pH+<7 and pOH->7, the solution has an excess of H3O+ and is described as an acidic solution. When pH+>7 and pOH_<7, the solution has an excess of OH- ions and is described as a basic solution.
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Physical properties of Alkyl cyanides (1) Alkyl cyanides are neutral substance with pleasant odour, similar to bitter almonds. (2) Alkyl cyanides are Lower members containin
The ratio between the neutrons in C and Si with respect to atomic masses 12 and 28 is: (1) 2 : 3 (2) 3 : 2 (3) 3 : 7 (4) 7 : 3 Ans: 3 : 7
The electronic configuration of copper (29 cu) is: (1)1s 2 , 2s 2 , 2p 6 , 3s 2 , 3p 6 , 3d 9 , 4s 2 (2) 1s 2 , 2s 2 , 2p 6, 3s 2 , 3p 6 , 3d 10 , 4s 1 (3) 1s 2 , 2s
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#space lattice, unit cell, calculation of particles per unit cell, laws of crystallography, symmetry elements in crystals, derivation of braggs equation#
Which of the following set of quantum numbers belong to highest energy: (1) n=4, l=0, m=0, s= +1/2 (2) n=3, l=0, m=0, s= +1/2 (3) n=3 l=1, m=1, s
Sources of aliphatic hydrocarbon Mineral or crude oil, petroleum is the dark colour oily liquid along with offensive odour found at several depths in many regions below the sur
When atoms are bombarded with alpha particles, only a few in n, others pass out undeflected. This is because : (1) The nucleus occupies much smaller volume compared to the volu
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