The pKa of a certain weak acid is 4.0. Calculate the ratio of proton acceptor to proton donor at pH 7.0.

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#Question id: 20136

#XL - P Chemistry

Ka for CH3COOH at 25ºC is 1.754 × 10^–5 . At 50ºC, Ka is 1.633 × 10^–5 What will be value of Δ Sº for the ionisation of CH3COOH?

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#Question id: 20137

#XL - P Chemistry

If uncertainty in position and velocity are equal then uncertainty in momentum will be

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#Question id: 20138

#XL - P Chemistry

Number of waves made by a Bohr electron in one complete revolution in its fourth orbit is

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#Question id: 20139

#XL - P Chemistry

Which of the following electronic transitions require that the greatest amount of energy be absorbed by a hydrogen atom?

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#Question id: 20140

#XL - P Chemistry

How fast an electron is moving if it has a wavelength equal to the distance it travel in one second?

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#Question id: 20141

#XL - P Chemistry

If uncertainties in the measurement of position and momentum are equal, the uncertainty in the measurement of velocity is