# Calculate the amount of the substance, which is 196 g of potassium hydroxide.

January 13, 2021 | education

| **Calculate the amount of the substance, which is 196 g of potassium hydroxide. How many ions of each type will this portion of alkali contain?**

Given:

m (KOH) = 196g

Find: n (KOH), N (K +), N (OH-)

Decision:

1) n (KOH) = 3.5 mol

2) Analysis of the formula for potassium hydroxide shows that N (K +) = n (KOH), a n (OH -) = 2 * n (KOH)

3) N (K +) = 1 * 3.5 = 3.5

4) N (OH -) = 2 * 3.5 = 7

Answer: 3.5 and 7.

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