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Chemistry
2. A solution is prepared by dissolving 1.50 g of Pb(NO3)2 in a small amount of water and diluting to a total volume of 250.00 mL.
a. Write a chemical equation (with phase symbols) to show what happens to a formula unit of Pb(NO3)2 when it is dissolved in water.
b. What is the molarity of this solution?
c. If a 25.00 mL sample of this solution were removed and diluted to a total volume of 100.00 mL, what would be the molarity of the diluted solution?
a. Write a chemical equation (with phase symbols) to show what happens to a formula unit of Pb(NO3)2 when it is dissolved in water.
b. What is the molarity of this solution?
c. If a 25.00 mL sample of this solution were removed and diluted to a total volume of 100.00 mL, what would be the molarity of the diluted solution?
Chemistry
4. A sample of chlorine gas occupies a volume of 18.35 L at STP. a. How many moles of chlorine are present in this sample?
b. What mass of chlorine gas does this represent?
c. Chlorine gas reacts violently with hydrogen gas to form hydrogen chloride gas. Write a balanced chemical equation for this reaction
d. The sample of chlorine is allowed to react with an excess of hydrogen as described in part (c). How many molecules of hydrogen chloride are formed in this reaction?
e. A solution of hydrochloric acid can be prepared by bubbling hydrogen chloride gas through pure water. If the products of the reaction in part (d) are bubbled through 500.00 mL of water, what is the molar concentration of the hydrochloric acid solution?
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b. What mass of chlorine gas does this represent?
c. Chlorine gas reacts violently with hydrogen gas to form hydrogen chloride gas. Write a balanced chemical equation for this reaction
d. The sample of chlorine is allowed to react with an excess of hydrogen as described in part (c). How many molecules of hydrogen chloride are formed in this reaction?
e. A solution of hydrochloric acid can be prepared by bubbling hydrogen chloride gas through pure water. If the products of the reaction in part (d) are bubbled through 500.00 mL of water, what is the molar concentration of the hydrochloric acid solution?
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Chemistry
How do you find the hydrogen ion concentration with the pH of 5.75?
Chemistry
gas sample analysis methods in analytical chemistry
Chemistry
calcium hydroxide is manufactured by heating calcium carbonate strongly to produce calcium oxide, and then adding a controlled amount of water to produce calcium hydroxide.
CaCO3(s)=CaO(s)+CO2(g)
CaO(s)+H2O(i)=Ca(OH)2(s)
a.) what mass of water would you produce from 1 tonne of calcium carbonate?
b.) what mass of water would you need to add to that calcium oxide?
c.) What mass of calcium hydroxide would you eventually produce?
(RAMs: H=1, C=12, O=16, Ca=40.)
CaCO3(s)=CaO(s)+CO2(g)
CaO(s)+H2O(i)=Ca(OH)2(s)
a.) what mass of water would you produce from 1 tonne of calcium carbonate?
b.) what mass of water would you need to add to that calcium oxide?
c.) What mass of calcium hydroxide would you eventually produce?
(RAMs: H=1, C=12, O=16, Ca=40.)
Chemistry
What is the molarity of 25 g of NaNO3 is dissolved in 400 ml of solution?
Chemistry
How many moles are 1.20x10 to the 25 power atoms of phosphorous
Chemistry
The determination in problem 15-9 was modified to
use the standard addition method. In this case, a 4.236 g tablet was dissolved in sufficient
0.10M HCl to give 1.00 L. Dilution of 20.00 mL aliquot to 100 mL yielded a solution
that gave reading of 448 at 347.5 nm. A second 20.00 mL aliquot was mixed with 10 mL
of 50 ppm quinine solution before dilution to 100 mL. The fluorescence intensity of this
solution was 525. Calculate the percentage of quinine in the tablet.
use the standard addition method. In this case, a 4.236 g tablet was dissolved in sufficient
0.10M HCl to give 1.00 L. Dilution of 20.00 mL aliquot to 100 mL yielded a solution
that gave reading of 448 at 347.5 nm. A second 20.00 mL aliquot was mixed with 10 mL
of 50 ppm quinine solution before dilution to 100 mL. The fluorescence intensity of this
solution was 525. Calculate the percentage of quinine in the tablet.
Chemistry
The solubility product constant KS for BaF2 is 1.70*10^–6. How much barium
difluoride can be dissolved in 2.00 liters of pure water?
difluoride can be dissolved in 2.00 liters of pure water?
Chemistry
Calculate the molar concentration of each ion (Na+ and PO4 3-) in a aqueous Na3PO4 solution when 2.0 g of Na3PO4 is dissolved in water so that the final volume of the solution is 150 ml.
