What temperature is necessary in order to dissolve twice as much fo these solids in 100cm3 of water as can be dissoved at 20gC.
a. sodium nitrate
b. potassium nitrate
c. sodium choride
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I will be happy to critique your solution.
To determine the necessary temperature in order to dissolve twice as much of these solids in 100 cm3 of water compared to what can be dissolved at 20°C, we need to consult solubility tables or charts.
Solubility is generally given in grams of solute that can be dissolved in 100 g (or sometimes 100 mL) of water at a specific temperature. By finding the solubility values for each solid at 20°C and doubling them, we can then find the corresponding temperature for the doubled solubility.
a. Sodium nitrate (NaNO3)
Find the solubility of sodium nitrate at 20°C. Let's say it is 80 g/100 g of water.
To dissolve twice as much, we need to double this value to 160 g/100 g of water.
Next, check the solubility tables or charts to find the temperature at which sodium nitrate has a solubility of 160 g/100 g of water. Let's say it is 60°C.
Therefore, the necessary temperature to dissolve twice as much sodium nitrate in 100 cm3 of water compared to 20°C is 60°C.
b. Potassium nitrate (KNO3)
Find the solubility of potassium nitrate at 20°C. Let's say it is 100 g/100 g of water.
To dissolve twice as much, we need to double this value to 200 g/100 g of water.
Next, check the solubility tables or charts to find the temperature at which potassium nitrate has a solubility of 200 g/100 g of water. Let's say it is 80°C.
Therefore, the necessary temperature to dissolve twice as much potassium nitrate in 100 cm3 of water compared to 20°C is 80°C.
c. Sodium chloride (NaCl)
Find the solubility of sodium chloride at 20°C. Let's say it is 36 g/100 g of water.
To dissolve twice as much, we need to double this value to 72 g/100 g of water.
Next, check the solubility tables or charts to find the temperature at which sodium chloride has a solubility of 72 g/100 g of water. Let's say it is 40°C.
Therefore, the necessary temperature to dissolve twice as much sodium chloride in 100 cm3 of water compared to 20°C is 40°C.
Remember that these values are just examples. Make sure to consult actual solubility tables or charts to get accurate and specific solubility values for each solid at different temperatures.