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Sodium bicarbonate (baking soda) is commonly used to absorb odor. Its solubility is 9.6g/100g H2O at 30oC and 16g/100g H2O at 60oC. At 60oC, 9.2 g of baking soda is added to 46 g of water.

A. Is the resulting mixture homogeneous at 60oC? if not, how many grams of baking soda are undissolved?

B. The mixture is cooled to 30oC. How many more grams of water are needed to make a saturated solution?

 

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Christian Garcia
Christian GarciaLv10
13 Nov 2020

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Related questions

Baking soda is pure sodium bicarbonate, NaHCO3, which dissolves and dissociates in water into thesodium ion and the bicarbonate ion. As most students know from demonstrations in grade school or athome, it can be mixed with vinegar for a rapid and entertaining chemical reaction that generates carbondioxide gas bubbling out of the reaction mixture.

The overall reaction can be written as:CH3COOH (aq) + Na+(aq) + HCO3–(aq) → Na+(aq) + CH3COO–(aq) + H2O(l) + CO2(g) in which the sodium ion is a spectator ion.

Baking soda or baking powder can be used in recipes as a leavening agent—that is, to produce carbondioxide gas to make dough or batter rise. Recipes using baking soda must include a separate acidicingredient such as buttermilk or vinegar. Recipes that do not include the separate addition of an acidicingredient usually require baking powder instead. Baking powder has a solid organic acid mixed in withthe baking soda, so that when the mixture is dissolved, the acid and sodium bicarbonate react with eachother. While commercial baking powder involves slightly more complicated chemistry, a good substitutefor baking powder can be made by adding baking soda to an acid such as potassium hydrogen tartrate(potassium bitartrate or cream of tartar). The formula for potassium hydrogen tartrate is KH C4H4O 6 . Your task is to devise a suitable substitute for baking powder by calculating the mass of cream of tartar in grams required to react with 10.00 g of baking soda. There should be enough cream of tartar added so that all of the baking soda will react to make carbon dioxide gas, but no more cream of tartar than that.

1. The solubility of a substance in 100g water is 50g at 25oC. 55 g of the substance is dissolved in water at 40oC and cooled to 25oC, no crystals appear. The solution is

A. supersaturated

B. saturated

C. unsaturated


2. In a mixture of 25.0g CaCl2, 40.0g LiCl, and 300 g of water , the mole percent of water is:

A. 93

B. 5.3

C. 1.3


3. In the reaction: NiCl2(aq) + 2NaOH(aq) -> Ni(OH)2(s) + 2NaCl(aq) ; How many mililiters of a 0.200M NaOH solution are needed to react with 18.0 ml of a 0.500M NiCl2 solution?

A. 90

B. 0.090

C. 45

D. 180


4. Shells consisting of CaCO3 can be found in deep waters

True

False


5. In the summer, fish in a pond will tend to be found at lower depths in the water

True

False

6. How many grams of KCl are needed to prepare 300.0 mL of a 0.14 M KCl solution?

A. 75

B. 3.1

C. 4.2


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