mistake‚ he replenished the left over solution with 50 ml of water. The new molarity of NaOH solution will be. (A) 2M (B) 3M (C) 2.5 M (D) 2.4 M 2.* Which of the following molarity values of ions in a aqueous solution of 5.85 % w/v NaCl‚ 5.55% w/v CaCl2 and 6% w/v NaOH are correct [Na = 23‚ Cl = 35.5 ‚ Ca = 40‚ O = 16 ] (A) [Cl–1] = 2M (B) [Na+] = 1M (C) [Ca2+] = 0.5 M (D) [OH–] = 1.5 M 3. For an ideal binary solution with PA 0 / PB 0 which relation between XA (mole fraction of A in liquid phase)
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Investigate the effect of concentration on the rate of a reaction Research question: To what extent does the concentration of hydrochloric acid affect the rate of the following reaction: 2 HCl(aq) + CaCO3(s) → CaCl2(aq) + H2O(l) + CO2(g) Data Collection and Processing: Table1: Different volumes of Co2 gas produced by Different concentrations of HCL acid. Volume of CO2gas formed from 5 different concentrations of HCL acid ±0.5ml 5 different concentrations of HCL acid (Mol) ±0.5ml Time (sec) ±0
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Are you turning to the answers too soon? When you get stuck on a question do everything you can to answer it EXCEPT looking at the answer 1. Use your textbooks 2. Use your notes 3. Use the presentations 4. Use drop in 5. Use websites Don’t ever simply copy down an answer without knowing how to get there. BUT finally do check all your answers carefully here. You can also read the examiner’s report for each question.
Free Atom Electron Covalent bond
CSEC CHEMISTRY NOTES ON PERIODIC TRENDS From Chemistry for CSEC by Tania Chung-Harris and Mike Taylor Chemistry for CAPE by Susan Maraj and Arnold Samai Periodic Trends in Group II Elements in Group II The elements in Group II are called alkaline earth metals. Be‚ Mg‚ Ca‚ Sr‚ Ba‚ Ra Beryllium‚ Magnesium‚ Calcium‚ Strontium‚ Barium‚ Radium These elements bond by metallic bonds (intramolecular forces) to form giant metallic structures. The size of the
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to its proficient freezing point depression and its cost efficiency. Introduction As scientists we were given the task to find the overall effectiveness of NaCl as a deicer. In choosing the best deicer we are comparing NaCl to KCl‚ MgCl2‚ and CaCl2. We believed NaCl to be the best deicer as it is well know that NaCl is quite commonly used in the United States as a deicer on roads and sidewalks during the winter. To determine whether or not NaCl is the best deicer we administered three days
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(w/v)) 6. Buffer PD3 (guanidinium hydrochloride and acetic acid) 7. W1 Buffer (guanidine hydrochloride and isopropanol) 8. Wash Buffer (70% ethanol) 9. Elution Buffer (10 mM Tris-HCl‚ pH8.5 at 25°C) 10. 1 ml of competent E. coli cells in 100mM CaCl2 11.
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Hydrogen Peroxide & Inorganic Peroxy Compounds Hydrogen Peroxide Hydrogen peroxide (H2O2) is the simplest peroxide (a compound with an oxygen-oxygen single bond). It is also a strong oxidizer. Hydrogen peroxide is a clear liquid‚ slightly more viscous than water. In dilute solution‚ it appears colorless. Reactions Decomposition Hydrogen peroxide decomposes exothermically into water and oxygen gas spontaneously: 2 H2O2 → 2 H2O + O2 This process is thermodynamically favorable. It has
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compound and can be determined from the standard calibration curve by solving for ε‚ as I know the absorbance and concentration and can measure the width of the cuvette. Abs = ε bc In this equation‚ the absorbance is equal to the concentration of the CaCl2 (c)‚ multiply by the length of the path the light takes through the cuvette (b)‚ and then multiply by the molar extinction coefficient (ε). It is extremely important to note that the length of the path the light takes through the cuvette is always
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EXPERIMENT 4: BACK TITRATION CONTENT NO. CONTENT PAGE 1. Synopsis 3 2. Introduction 3 3. Theory 4 4. Procedure 4 5. Results and Calculations 5 – 6 6. Discussion 7 7. Conclusion 7 8. References 8 1. SYNOPSIS The purpose of this experiment is to use the back titration method to determine the percentage of calcium carbonate in toothpaste. Instead of using standard titration methods where an acid is titrated directly using a standard solution of a base‚ back titration is used because
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that the thoracic cavity was exposed and the pericardium was carefully cut away and the heart exposed. The frog was occasionally bathed in Frog Ringer’s solution that was an electrolyte solution that contained 6.5 g/L NaCl‚ 0.41 g/L KCl‚ 0.12 g/L CaCl2‚ and 0.20 g/L of NaHCO3. Force transducer setup: The force transducer was set up on a ring stand with the force transducer mounted on the micropositioner. The force transducer was then connected to PowerLab‚ zeroed out‚ and also had its
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