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What does it mean by the solution should be concentrated by $\ce{H2SO4}$ up to 95% with a temperature of $\pu{443 K}$ for the dehydration of primary alcohol?

Dehydration of primary alcohol:

$$\ce{CH3-CH2-OH ->[\text{conc.} H2SO4 (95\%)][\pu{170 ^\circ C}] CH2=CH2}$$

By considering the above reaction conditions: Are these conditions the minimum conditions for this reaction? How can we proceed this reaction with a concentration less than the above mentioned concentration (can we reduce the needed concentration by increasing the temperature more than the conditions ask us to give)? In the same way can we proceed the reaction with a lesser temperature compared to the given reaction temperature by increasing the concentration more than the reaction needs to proceed?

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