Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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- The amount of nitrogen in an organic substance can be determined by an analytical method called the Kjeldahl method, in which all the nitrogen in the organic substance is converted to ammonia. The ammonia, which is a weak base, can be neutralized with hydrochloric acid, as described by the equation NH, (aq) + HCl(aq) → NH₂Cl(aq) If 46.0 mL of 0.150 M HCl(aq) is needed to neutralize all the NH, (g) from a 2.25 g sample of organic material, calculate the mass percentage of nitrogen in the sample. mass percentage:arrow_forwardGive the complete ionic equation for the reaction (if any) that occurs when aqueous solutions of H2SO4 and KOH are mixed. OH(aq) + OH¯(aq) → H₂O(l) O H+ (aq) + OH(aq) + 2 K+ (aq) + SO4²-(aq) → H+ (aq) + OH¯(aq) + K₂SO4(s) O No reaction occurs. O 2 K+ (aq) + SO4²- (aq) → K₂SO4(s) H+ (aq) + OH Taq) + 2 K+ (aq) + SO42 (aq) → H₂O(l) + 2K+ (aq) + SO4²- (aq)arrow_forward5.00 mL of 2.5 M NaCl(aq) is diluted with water to the calibration line in a 100.00 mL volumetric flask. What is the concentration of the new solution?arrow_forward
- One way to determine the hardness of a water sample is to precipitate the calcium out of solution as a carbonate. The net ionic reaction for this precipitation is: Ca2+(aq) + CO32-(aq) → CaCO3 (s) A 1.00 L sample of water is drawn from a Phoenix, AZ well and 0.534 g of calcium carbonate is recovered using the above reaction. What was the Ca2+ concentration of the original water sample in ppm? Show your work and include units. Hint: ppm stands for parts per million, and in the case of an aqueous solution, this is equivalent to mg/L.arrow_forwardTo measure the amount of calcium carbonate (CaCO3) in a seashell, an analytical chemist crushes a 4.30 g sample of the shell to a fine powder and titrates it to the endpoint with 233. mL of 0.2700M hydrogen chloride (HCI) solution. The balanced chemical equation for the reaction is: 2HCl(aq) + CO3(aq) → H₂CO3(aq) + 2Cl(aq) 19 0 What kind of reaction is this? O precipitation O acid-base redox X olo If you said this was a precipitation reaction, enter the chemical formula of the precipitate. 0 Ar If you said this was an acid-base reaction, enter the chemical formula of the reactant that is acting as the base. If you said this was a redox reaction, enter the chemical symbol of the element that is oxidized. Calculate the mass percent of CaCO3 in the sample. Be sure your answer has 3 significant digits. П 0 0% S ?arrow_forwardBalance and write the net ionic equation for the following reaction Mg(s) + AgNO3(aq) → Mg(NO3)2(aq) + 2Ag(s) Balanced Equation: Complete Ionic Equation: Net Ionic Equation:arrow_forward
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