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A student combines solutions of silver nitrate, #AgNO_3#, and sodium chromate, #Na_2CrO_4#, and observes that a reddish-brown solid forms. Based on this observation, what type of a reaction can the student infer has occurred?

Answer 1

A metathesis, or partner exchange reaction has occurred:

#2AgNO_3(aq) + Na_2CrO_4(aq) rarr 2AgNO_3(aq) + Ag_2CrO_4(s)#

Most silver salts are quite insoluble; the nitrate is an exception. Silver chromate precipitates from aqueous solution as a brick red precipitate.

The reaction could also be called a #"precipitation reaction"#. This particular reaction is the basis of the #"Mohr titration"#, for quantitative analysis of silver ion.

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Answer 2

Naomi Aronson

It is clear to the student that a precipitation reaction has taken place.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.