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Answer:To determine how many teaspoons of sugar can dissolve completely in 20 ml of water, we need to consider the solubility of sugar in water. The solubility of sugar in water varies depending on the temperature, but at room temperature (around 25°C), approximately 1 teaspoon of sugar is equivalent to 4 grams. Given that 1 teaspoon is around 4 grams, we can calculate how many teaspoons of sugar can dissolve in 20 ml of water: 1. Convert the volume of water from milliliters (ml) to grams (g). Since 1 ml of water is approximately 1 gram, 20 ml of water is equal to 20 grams.2. Consider that sugar's solubility in water is around 2000 grams per liter (at room temperature).3. Calculate the maximum amount of sugar that can dissolve in 20 grams (20 ml) of water.4. Convert the amount of sugar dissolved in grams to teaspoons. Using this information, we can calculate the number of teaspoons of sugar that can dissolve in 20 ml of water. Let's perform the calculation: 1. The amount of sugar that can dissolve in 20 ml (20 grams) of water is approximately 20 grams.2. To convert 20 grams to teaspoons (assuming 1 teaspoon is around 4 grams), we have:- 20 grams ÷ 4 grams per teaspoon = 5 teaspoons Therefore, approximately 5 teaspoons of sugar can dissolve completely in 20 ml of water at room temperature.