What should be done if a spectrophotometer reports an absorbance that is too high?

Absorbance values greater than or equal to 1.0 are too high. If you are getting absorbance values of 1.0 or above, your solution is too concentrated. Simply dilute your sample and recollect data . Keep in mind that absorbance is the logarithm of the transmission (T) of light through a sample

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The correct answer is soluble metal salt and carbon dioxide.

Explanation:

Both the carbon dioxide and the soluble metal salt may react with a base to produce a solid or what is known as a precipitate. An example of soluble metal salt like calcium nitrate when reacts with a base like sodium hydroxide, leads to the generation of solid calcium hydroxide and sodium nitrate, the reaction is known as the precipitation reaction.  

Ca(NO₂)₂ (aq) + NaOH (aq) ⇒ Ca(OH)₂ (s) + NaNO₃ (aq)