Multiple choice

In what ratio should a $6.5NH{NO}{3}$ be diluted with water to get $3.5N$ $H{NO}{3}$?

  1. $6:7$
  2. $7:6$
  3. $5:6$
  4. $6:5$
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B Correct answer
AI explanation

Using the alligation method for the normalities, place the higher concentration 6.5N and the water concentration 0N on the left, with the target mixture 3.5N in the middle. The ratio of acid to water is the difference between the target and 0N (3.5) to the difference between 6.5N and the target (3.0). This gives a mixing ratio of 7 to 6.

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