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1. How many grams of dry NH4Cl need to be added to 2.40 L of a 0.200 M solution of ammonia, NH3, to prepare buffer solution that has a pH of 8.83? Kb for ammonia is 1.8×10-5.
2. A beaker with 115 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M
A student adds 4.20 mL of a 0.490 M HCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.740.
3. Calculate the molar solubility of SrF2 in the following substances.
1.5×10-2 M Sr(NO3)2
1.3×10-2 M NaF
4. There is a solution that is 3.5×10-2 M in HCN (Ka=4.9×10-10) and 1.0×10-2 M in NaCN. Calculate the percent dissociation of HCN in this solution.
A 52.0-g sample of an alloy at 93.0°C is placed into 379 g of water at 22.0°C in an insulated coffee cup. Assume that no heat is absorbed by the cup.
How much heat is required to warm 1.50 L of water from 30.0 C to 100.0 C? (Assume a density of 1.0g/mL for the water.)
The concentration of CO2 in a soft drink bottled with a partial pressure of CO2 of 6.5 atm over the liquid at 29°C is 2.2 × 10-1 M. Determine the Henry's law constant for CO2 at this temperature.
A buffer is made by dissolving 11.2 g of sodium dihydrogen phosphate, NaH2PO4, and 17.7 g of disodium hydrogen phosphate, Na2HPO4, in a liter of solution. What is the pH of the buffer?
Explain in term of CFSE, why high spin Cr2+ is a good reducing agent and low spin Mn2+ is a good oxidizing agent. Both ions are d4
A mixture containing 3.3 moles of NO and .85 mole of CO2 was allowed to react in a flask at a certain temperature according to the equation.
A compound reported in 1982 has a molecular mass of 834g/mol. A20.0g sample contains 18.3g of iodine as well as the remainder is carbon. Explain what is the molecular formula of the compound
Of the seven categories of matter (metallic network, non-metallic network, ionic-covalent network, ionic network, polar molecular, weakly polar molecular, and non-polar molecular), which are the most similar. Why
If 0.25 mol of Br2 and .55 mol of Cl2 are introduced to a 3.0 L container at 400K, what will be the equilibrium concentration of Br2?
a reaction in water causes the water in beaker to cool from 25 degrees celsius to 21 degrees celsius. the volume of
The combustion of pentane can be represented by the following equation:__C5H12(g) + __O2(g) → __CO2(g) + __H2O(g)Balance the equation and answer the next questions.
Calculate to two significant figures: a. the equilibrium concentrations of A, B, C and D. b. the value of the equilibrium constant for the reaction.
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