a. A 1 liter solution contains 0.509 M
hypochlorous acid and 0.382 M
potassium hypochlorite.
Addition of 0.191 moles of hydroiodic
acid will:
(Assume that the volume does not change upon the addition of
hydroiodic acid.)
Raise the pH slightly
Lower the pH slightly
Raise the pH by several units
Lower the pH by several units
Not change the pH
Exceed the buffer capacity
b. A 1 liter solution contains 0.246 M
hypochlorous acid and 0.328 M
potassium hypochlorite.
Addition of 0.271 moles of sodium
hydroxide will:
(Assume that the volume does not change upon the addition of
sodium hydroxide.)
Raise the pH slightly
Lower the pH slightly
Raise the pH by several units
Lower the pH by several units
Not change the pH
Exceed the buffer capacity
In: Chemistry
Sulfur dioxide and oxygen react exothermically according to the thermochemical equation shown below. Calculate the maximum amount of heat that could be released if 15.0 g of O2 gas is allowed to react with 13.4 L of SO2 gas at 1.00 atm and 15°C. (CAUTION: This problem may not be as simple as it looks. So please think about it before you start working.) 2 SO2(g) + O2(g) → 2 SO3(g) ΔH° = –198 kJ
In: Chemistry
If 2.99 g of sodium peroxide (Na2O2) react
with water to produce sodium hydroxide and oxygen, how many liters
of oxygen will be produced at 30.4 °C and 734 torr?
2 Na2O2(s) + 2 H2O(l) → 4 NaOH(aq) + O2(g)
In: Chemistry
1) A sample of gas in a balloon has an initial temperature of 45C and a volume of 1.28×103 L . If the temperature changes to 62C , and there is no change of pressure or amount of gas, what is the new volume, V2 of the gas?
V2=?
2) What Celsius temperature T2, is required to change the volume of the gas sample in Part A (T1=45C, V1=1.28×103 L) to a volume of 2.56×103 LL ? Assume no change in pressure or the amount of gas in the balloon.
T2=?
In: Chemistry
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A 110.0 mL buffer solution is 0.110 molL−1 in NH3 and 0.125 molL−1 in NH4Br. |
Part A (PLEASE ANSWER EVERY PART CORRECTLY :)) What mass of HCl will this buffer neutralize before the pH falls below 9.00? (Kb(NH3)=1.76×10−5 Express your answer using two significant figures.
Part B If the same volume of the buffer were 0.265 molL−1 in NH3 and 0.390 molL−1 in NH4Br, what mass of HCl could be handled before the pH fell below 9.00? Express your answer using two significant figures.
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In: Chemistry
Classify each of the following reactions as one of these four types:
• spontaneous at all temperatures • not spontaneous at any temperature • spontaneous below a certain temperature but not above
• spontaneous above a certain temperature but not below
(a) PbS (s) + Mg (s) → Mg (s) + Pb (s); ∆H = 66 kJ; ∆S = -9 J/K
(b) 2 SO2 (g) + O2 (g) → 2 SO3 (g); ∆H = -197.8 kJ; ∆S = -188.1 J/K
(c) 2 N2O (g) + O2 (g) → 4 NO (g); ∆H = 199.5 kJ; ∆S = 198.2 J/K
(d) 2 C8H18 (l) + 25 O2 (g) → 16 CO2 (g) + 18 H2O (g); ∆H = -10139 kJ; ∆S = 977 J/K
In: Chemistry
calculate the ph of 1.0 l of a buffer that is .01 m of HNO2 and .15 m NaO2. what is the ph of the same buffer and after the additon of 1.0 l of 12m hcl (pka of HNO2 is 3.4)
In: Chemistry
A sample of granite at 85.0 C is immersed into a 75.0g of water at 24.0C. At equilibrium the temp. is 28.7C, what is the mass of the granite? (Cs for granite=.790 J/g*C)
In: Chemistry
If at 30F the air has 25% relative humidity, what is the relative humidity at 70F and how much moisture must be added to get it up to 50% relative humidity.
In: Chemistry
Arrange the following reaction in order of increasing S value.
1. H2(g) + F2(g) 2HF(g)
2. NH4NO3(s) N2O(g) + 2H2O(I)
3. (NH4)2 Cr2O7(s) Cr2O3(s) + 4H2O(I) +N2(g)
In: Chemistry
How do 'coupled reactions' allow life (as a biochemical process) to exist?
In: Chemistry
A) How many grams of solid sodium
fluoride should be added to 2.00
L of a 0.190 M hydrofluoric acid
solution to prepare a buffer with a pH of 2.425
?
grams sodium fluoride = g.
B) How many grams of solid sodium
fluoride should be added to 1.00
L of a 0.299 M hydrofluoric acid
solution to prepare a buffer with a pH of 3.825
?
grams sodium fluoride = g.
C) How many grams of solid ammonium
bromide should be added to 1.00 L
of a 9.88×10-2 M
ammonia solution to prepare a buffer with a pH of
10.080?
grams ammonium bromide = g.
In: Chemistry
I was analyzing the sample in Agilent HPLC
and I got 3 peaks at 3.654min, 4.540min and 7.839min with 0.1175, 0.1366 and 0.1571 width values
anyone knows how to calculate N value (#of plates), retention factor, selectivity factor and resolution value for this chromatograms?
In: Chemistry
1. How would the reaction be affected if bromoethane were used instead of iodoethane?
2. How would the reaction be affected if 2-iodopropane were used instead of iodoethane?
experiment: http://legacy.earlham.edu/~seuka/Biochemistry/Ex.%2007%20Saccharin%20Alkylation.pdf
In: Chemistry
what is the new PH of a solution if 10ml of 0.1 M Hcl is added to 150ml of a buffer system that is 0.1M Benzoic acid and 0.1M sodium benzoate ( the Ka of benzoic acid is 6.3X10^-5). Thanks
In: Chemistry