H,O Lab Time: 1:30 PmH,0 + COH2 CozHcozt : PH -AR+NeoAir1. Knowing that these 2 molecules are always floating in the air, hypothesize why your distilled water ( whichindeed was pure when put in the container and therefore should have been pH 7), instead had a pH between 5and 6 (i.e. acidic, not neutral).2. Hypothesize why the addition of sucrose did not change the pH of distilled water (a big hint to the answer is inthe lab section on Acids & Bases).

Distilled water is pure water and it has a pH 7 but when it's pH is checked it do not show neutral…

Answered: 1. Knowing that these 2 molecules are…

Principles Of Pharmacology Med Assist

6th Edition

ISBN:9781337512442

Author:RICE

Publisher:RICE

Chapter8: Forms Of Drugs And How They Act

Section: Chapter Questions

Problem 30RQ

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The pH of a solution is 7, what is the H+ concentration? Group of answer choices 1 x 10e-7 M 1 x 10e-3 M 1 x 10e-8 M 1 x 10e-9 M
Explain the color changes observed throughout the peroxide value of oil experiment. Materials:1. Old and fresh oil samples2. Distilled water3. Acetic acid/chloroform solution4. Saturated potassium iodide solution5. Sodium thiosulphate (0.01M)6. 1% Starch indicator: dissolve 1g of starch in 10 ml of water and then add 90 ml of hotwater to it
Physical and Biological SciencesA bomb calorimeter was calibrated by burning 1.013 g of benzoic acid(C7H6O2) (ΔUcomb = 3.221 × 103 kJ/mol). The temperature change in thecalorimeter during the calibration combustion was 5.19°C. A nutritional chemist then used the calibrated calorimeter to determine the energy con-tent of food. The chemist carefully dried a sample of food and placed 0.8996 g of the sample in the calorimeter with sufficient oxygen for thecombustion to go to completion. Combustion of the food sample causedthe temperature of the calorimeter to increase by 4.42°C.1. Approximately how many moles of O2 gas were consumed in thecalibration combustion?a) 0.008 c) 0.2b) 0.1 d) 0.06 2. What is the heat capacity (CV) of the calorimeter?a) 5.15 kJ/°C c) 5.12 kJ/°Cb) 5.08 kJ/°C d) 4.97 kJ/°C3. What is the energy content of the food?a) 22.8 kJ/g c) 25.3 kJ/gb) 4.97 kJ/g d) 0.201 kJ/g4. What would be the effect on the result if the food sample were notcompletely dried prior to being…
The pH probe/meter uses following equations: Ecell = L + 0.0592 log a1 = L - 0.0592 pH Where L = L1 + EAg/AgCI + Easy= constants L1 = - 0.0592 log a2 a1 = activity of analyte solution a2 = activity of internal solution How will measured pH value be affected vs “real” pH if the temperature of the sample is 30C when pH was measured ? a.measured pH is lower than real pH b.impact can not be determined c.measured pH is higher than real pH d.measured pH is same as real pH
The pH probe/meter uses following equations: Ecell = L + 0.0592 log a1 = L - 0.0592 pH Where L = L1 + EAg/AgCI + Easy= constants L1 = - 0.0592 log a2 a1 = activity of analyte solution a2 = activity of internal solution How will measured pH value be affected vs “real” pH if HCl in pH electrode, became 0.15M instead of 0.1M ? a.impact can not be determined b.measured pH is higher than "real" pH. c.measured pH is lower than "real" pH. d.measured pH is same as "real" pH.
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How do you measure the amount of µmoles of a substance from absorbance? If the absorbance is 0.019, the extinction coefficient is 0.0106(µmol/mL)-1 cm-1, path length is 1cm, and the total volume was 4 mL.
You are asked to design three buffers of the following pH values: 9.10, 10.45, and 4.65. You have the following 0.10M solutions available: CH3COOH, CH3COONa, NH4Cl, NH3, NaHCO3, and Na2CO3.Which solution will you choose to design each buffer?pH 4.65 ___________________________________________________ pH 9.10 ___________________________________________________ pH 10.45 __________________________________________________
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The pHpH scale for acidity is defined by pH=−log10[H+] where [H+]is the concentration of hydrogen ions measured in moles per liter (M). A solution has a pH of 10.2. Calculate the concentration of hydrogen ions in moles per liter (M).
A solution with pH 4 has __________ the H+ concentration of pH 8.

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