Baking powder consists of 4 ingredients – CaHPO4, NaAl(SO4)2, NaHCO3 and
cornstarch. Using the guidelines below, determine the masses of each ingredient
in a sample of baking powder using the following specifications:. (Tip: Parts i, ii
v and vi below should be VERY easy – if they aren’t, you are thinking too hard)!
i) Contains 0.250 tsp CaHPO4 (1 tsp = 7.12g)
ii) Contains twice as much NaAl(SO4)2 by mass as CaHPO4
iii) Contains enough NaHCO3 to fully react with CaHPO4
iv) Contains enough NaHCO3 to fully react with NaAl(SO4)2
v) Contains the same amount by mass of cornstarch (an inert ingredient) as the
total amount of NaHCO3
vi) Determine the total mass of your sample of baking powder. (Your baking
powder should include the CaHPO4, the NaAl(SO4)2, the total amount of
NaHCO3 and the cornstarch).
And you know how to do what parts? Show your work and explain what you don't understand about those parts you need help with.
i don't understand how to do it
To determine the masses of each ingredient in a sample of baking powder, let's go through each guideline step by step:
i) It is given that the sample contains 0.250 tsp of CaHPO4 and that 1 tsp equals 7.12g. Therefore, the mass of CaHPO4 in the sample can be calculated as follows:
Mass of CaHPO4 = 0.250 tsp * 7.12g/tsp
ii) It is stated that the sample contains twice as much NaAl(SO4)2 by mass as CaHPO4. So, to find the mass of NaAl(SO4)2, we can simply multiply the mass of CaHPO4 by 2:
Mass of NaAl(SO4)2 = 2 * Mass of CaHPO4
iii) According to guideline iii, the sample contains enough NaHCO3 to fully react with CaHPO4. This means that the amount of NaHCO3 should be equal to or greater than the amount of CaHPO4. We don't need to calculate the exact mass in this step.
iv) Guideline iv states that the sample contains enough NaHCO3 to fully react with NaAl(SO4)2. Similar to step iii, we don't need to determine the exact mass at this point.
v) The sample contains the same mass of cornstarch (an inert ingredient) as the total amount of NaHCO3. Since we know the total amount of NaHCO3 is equal to or greater than the amount of CaHPO4, we can assume the same mass for cornstarch as the mass of NaHCO3.
vi) To determine the total mass of the sample, we need to add up the masses of all the ingredients, including CaHPO4, NaAl(SO4)2, NaHCO3, and cornstarch.
With these guidelines, you can calculate the masses of each ingredient in the sample of baking powder.