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Which is the equivalence-point pH if 25.0 mL HCOOH (1.8 x 10-4) requires 29.80 mL 0.3567 M NaOH to reach the equivalence point?
AnswerA. 2.06B. 5.48C. 8.52D. 9.26
Which process best accounts for the numerical value of the equivalence-point pH after the titration of formic acid, HCOOH with NaOH?AnswerA. HCOO- (aq) + H2O (l) <--------> HCOOH (aq) + OH- (aq)B. HCOOH(aq) + H2O(l) <-------> -COOH (aq) + H3O+ (aq)C. HCOOH (aq) + H3O+ (aq) <--------> HCOOH2+ (aq) + H2O(l)D. HCOOH(aq) + H2O(l) <-------> HCOOH2+ (aq) + OH- (aq)
A 1- flask is filled with 1.45 of argon at 25 . A sample of ethane vapor is added to the same flask until the total pressure is 1.30 .What is the partial pressure of argon, , in the flask?
Calculate the mass of sodium chlorate that must be decomposed to form 6.5 g of oxygen. 2NaClO3(s) → 2NaCl(s) + 3O2(g)
A chemist wishes to prepare 200mL of a saturated solution of BaF2, the concentration of which is 6.3 x 10-3 mol/L. Determine the mass of BaF2 that will be needed to make up the 200mL of the solution.
Photoheterotrophic microorganisms that use photoenergy, but depend on organic matter as a carbon source, are abundant and widespread
Calculate the vapor pressure at 20?C of a solution containing 3.641 g of naphthalene in 22.7 g of chloroform (CHCl3). Naphthalene (C10H8) has a low vapor pressure and may be assumed to be nonvolatile. The vapor pressure of chloroform at 20?C is 15..
A closed vessel contains moist air at 20 degree celcius, the relative humidity being 30 %. What would be the relative humidity become if the vessel were cooled to 10 degree celcius?
67 g of ice at 0 degree C added to a sample of water at 6 degrees, all the ice melts and decreases to 0 degrees. how many grams of water was in the sample?
what is the pH of a solution of 125ml of 3.5 M of CH3COOH and 25ml of 1.25 M of NaOH ?
Take N3 as the independent variable and solve for N2 in terms of N3. Then solve for N1 in terms of N2 and N3. b. Taking note that there cannot be a negative population, what are the possible values of N3 ?
Calculate the molarity and the molality of an NH3 solution made up of 36.5 g of NH3 in 70.0 g of water. The density of the solution is 0.982 g/mL.
What is the volume of a sample of chlorine gas with a density of 0.0032 g/cm3 and a mass of 1.45 g?
Assuming an ideal solution, what is the molecular mass of the compound?
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