Phosphoric acid solution is used to acidify jams to provide a tangy or sour taste. Calculate the amount of phosphoric acid, in moles, that is in 29.4 mL of a 5.71 mol/L phosphoric acid solution.

A chemistry student weighs out 0.170 g of citric acid (H₂CH₂O₂), a triprotic acid, into a 250. mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.1700 M NaOH solution. Calculate the volume of NaOH solution the student will need to add to reach the final equivalence point. Be sure your answer has the correct number of significant digits. 0mL x10 X

According to Wikipedia, Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon. The method was developed in the late 1940s at the University of Chicago by Willard Libby, who received the Nobel Prize in Chemistry for his work in 1960. It is based on the fact that carbon- 14 is constantly being created in the atmosphere by the interaction of cosmic rays with atmospheric nitrogen. The resulting carbon-14 combines with atmospheric oxygen to form radioactive carbon dioxide, which is incorporated into plants by photosynthesis; animals then acquire carbon-14 by eating the plants. When the animal or plant dies, it stops exchanging carbon with its environment, and thereafter the amount of carbon-14 it contains begins to decrease as the carbon-14 undergoes radioactive decay. Measuring the amount of carbon-14 in a sample from a…

A large freshwater (total mass of water 10^5 kg) lake contains no lithium. A sudden spill releases a constant lithium contaminated flow discharging 3.98*10^8 mg of lithium/hr. How long will it take until the lake reaches a lithium concentration of 1.1nmol/kg?

Cl₂(g) + 2e Cr₂0 (aq) + 14 H(aq) + 6€¯ O2(g) +4 H(aq) + 4e¯ MnO2(s) + 4H(aq) + 2e¯ 10, (aq) +6H(aq) +5e¯ VO₂+ (aq) + 2H(aq) + e¯ Br₂(1) + 2e NO, (aq) +4 H(aq) + 3e¯ ClO2(g) + e 2 Cl(aq) Ag* (aq) + e Fe3+(aq) + e 2 Cr³+ (aq) + 7 H₂O(1) 1.36 1.33 2 H₂O(1) 1.23 Mn2+(aq) + 2 H₂O(1) 1.21 12(aq) + 3H2O(l) 1.20 VO²+(aq) + H₂O(1) 1.00 2 Br (aq) 1.09 NO(s) + 2 H2O(1) 0.96 CIO₂ (aq) 0.95 Ag(s) 0.80 Fe2+(aq) 0.77 What is the E° cell for the reaction Cr₂O²² + CIO₂ → Cr³+ + CIO₂? a. 2.28 V. b. -2.28 V. c. 0.38 V. d. -0.38 V.

Unit 3-Two slides 11. Create a question that involves your compound and the formula m= n.M. Solve the question and show all of your work. wwwww 12. Create a question that involves your compound and the formula n = N/NA. Solve the question and show all of your work. TE

Chemistry. The best fit line is y = 1.03892x + 0.1448   1) If a sample had an absorbance of 0.333, what would be the concentration? 2) If a sample had a concentration of 0.40 mg/ml, what would be the absorbance?

4. You are trying to determine the volume of your setup according to the procedure in the lab manual. You have determined the following: Mass Standard CaCO3 0.4453 g % CaCO3 Pi Pf Ti Tf 99.6 % 50.5 kPa 129.5 kPa 20.33 °C 21.88 °C What is the volume of the setup in L? The volume is 0.138 L

A chemistry student weighs out 0.117 g of hypobromous acid (HBrO) into a 250. mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.1600 M NaOH solution. Calculate the volume of NaOH solution the student will need to add to reach the equivalence point. Be sure your answer has the correct number of significant digits. mL 0 x10 X

What is calibration and why is it essential in relation to food analysis? Provide examples.