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The sensitivity of a spectrophotometer allows detection of 1 percent of one colored form of an indicator for example HIn in the presence of 99 percent of the other colored form In-. Based on this fact, over what pH range relative to its pK can an indicator be used if a spectrophotometer is employed
Given that translational and rotational degrees of freedom typically behave classically, but vibrations behave quantum mechanically, the total (avg) energy of a diatomic is predicted to be U= (5/2)RT+ , where is obtained from Eq.124.
An aqueous solution of CaCl2 has a vapor pressure of 83.0mmHg at 50 C . The vapor pressure of pure water at this temperature is 92.6mmHg .
Lakes that have been acidified by acid rain can be neutralized by liming, the addition of limestone (CaCO3). How much limestone (in kg) is required to completely neutralize a 4.3 billion liter lake with a pH of 5.5?
What difference in their structural properties renders the triethylene glycol the only one that will work?
Oxygen at 150 K and 41.64 atm has a tabulated specific volume of 4.684 cm3/g and a specific internal energy of 1706 J/mol.
Addition of HBr to 1-phenylpropene yield only (1-bromopropyl)benzene. Propose a mechanism for the reaction and explain using resonance structures why none of the other regioisomer is produced?
The concentration of ordinary bleach is 6% w/v. How many grams of NaOCl are there in 1.00 gallon of bleach?
If 545 mL of oxygen gas is collected at 21ºC and 754 mm Hg, what is its volume at STP?
A 325-mL sample of solution contains 25.3 g of CaCl2, which is fully dissolved. Calculate the molar concentration of Cl- in this solution.
proportional only to the numbers of hydrogens that give each product when substituted for by chlorine. What would be the relative yield of each product?
Calculate the amount of heat needed to convert 96 g of ice at -24C to water at 28C. The specific heat capacity of H2O(s) is 2.1J/g*C.
Sodium carbonate Na_2CO_3) is used to neutralize the sulfuric acid spill. How many kilograms of sodium carbonate must be added to neutralize 4.03×103 kg of sulfuric acid solution?
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