Understanding heat, enthalpy, and entropy when boiling water.
If you boil water are you increasing Delta H, Delta E, or Delta S (heat, enthalpy, or entropy)?
Calculating the mass when given moles.
Find the mass of 3.65*10^-2 mol K2SO4
Calculating the density of a gas at STP.
What is the density of N2O at STP?
Calculating moles, molar mass and molecular weight
The chlorophyll-a molecule, C55H72MgN4O5, is important in photosynthesis. (a) Determine its molecular mass (in atomic mass units) (b) What is the mass (in grams) of 3.00 moles of chlorophyll-a molecules?
Question 1 An unknown salt solution was made in the stockroom using 150.0 grams of salt and 500.0 grams of water. Do the following problems based on this solution. a) calculate the %NaCl and % water by weight b) if you evaporated 88.840 grams of solution, what weight of salt should you get c) If a student needed to recov ...continues
The chloride in a saline solution was determined by the Volhard method. A 25 ml aliquot of the solution was acidified with 2 ml of dilute HNO3 and treated with 25 ml of .1749 M AgNO3 (fw 169.9), causing precipitation of AgCl. After addition of several ml of nitrobenzene, the solution required 26.40 ml of .1575 M KSCN to reach t ...continues
what is the oxidation reaction for Ag + NaCl?
For my AP chemistry lab, I was supposed to find the percent of silver in a dime. I started out with the formula: Ag + NaCl → AgCl +Na. The dime was put in a covered beaker with NaCl. However, during the experiment oxygen was added as one of the reactants, accidentally. The precipitated silver chloride was obviously con ...continues
Determining minimum pH for precipitate formation
What is the minimum pH at which aluminum hydroxide will precipitate from a 0.020 M aluminum nitrate solution. Consider activity effects and assuming the pH can be changed without increasing the solution volume.
Determining if a precipitate will form
If 50 mL each of 0.0010 M MgCl2, 0.0010 M Na3PO4, 2.0 M NH3 and 2.0 M NH4Cl are mixed, will a precipitate form?
Determine concentration of potassium chromate to use (Mohr titration)
A titration of 0.100 M Cl^- with 0.100 M Ag^+ used an end point where silver chromate gives an orange precipitate. Select the concentration of potassium chromate that must be present so the orange-colored silver chromate precipitate will appear just when 99.5% of the chloride has been precipitated. Given: Ksp of AgCl = 1.0 x 10 ...continues
