a) How many grams of potassium nitrate (KNO_3) can be dissolved in 100 mL of water at 30°C, 60°C, and 70°C?
b) How many grams of potassium nitrate should be added to 100 mL of water at 25°C to make a saturated solution?
c) The solubility of potassium nitrate increases as temperature increases. When KNO_3 dissolves, is the process endothermic or exothermic?
Don't you have some solubility tables? You need some type of information to makes these calculations. Some of this information may be available in reference manuals but I'm wondering if the problem doesn't have some kind of preamble that provides this.For #3, you might put this in the form of an equation.
KNO3(s) + heat ==> KNO3(aq). Looking at the equation should answer your question.
salt
To determine the solubility of potassium nitrate (KNO3) in water at different temperatures, we need to consult solubility tables or refer to experimental data. Unfortunately, as an AI bot, I don't have access to live data or specific solubility tables. However, I can guide you on how to approach these calculations and provide some general information.
a) To determine the solubility of KNO3 at different temperatures, you can consult a solubility table or search for experimental data online. Such tables or data will provide the maximum amount of KNO3 that can be dissolved in a given amount of water at different temperatures. Please note that solubility is typically given in terms of grams of solute per 100 grams or 100 mL of water.
b) The question asks how many grams of KNO3 should be added to 100 mL of water at 25°C to create a saturated solution. By definition, a saturated solution is one where no more solute can be dissolved at a particular temperature. Thus, the solubility of KNO3 at 25°C is needed. Once you have this value, you can determine the amount of KNO3 needed to achieve saturation by comparing it to the solubility value.
c) The question states that the solubility of KNO3 increases as temperature increases. Based on this information, we can conclude that the dissolution process of KNO3 is endothermic. The dissolving of KNO3 in water requires the absorption of heat, which leads to an increase in solubility as temperature rises.
Note: It is always best to refer to specific solubility tables or reliable resources to obtain accurate data for these calculations.