The cell has a potential of 0.2106 v when the solution in the right-hand compartment is a buffer of ph 4.006. calculate the ph and the hydrogen ion activity of each unknown, if when the buffer is replaced with unknowns, the following potentials are obtained from?

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

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substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.