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What, if anything, is wrong with the following statement: “When NaCl is dissolved in water, the water molecules closest to the ions will tend to preferentially orient themselves so that their oxygen atoms face the sodium ions and face away from the chloride ions”? Explain your answer.
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- The normal range of the sodium electrolyte in the body is 134 to 145 mEq/L. The term mEq is dependent on the charge of the ion. Since sodium is a +1 ion, 134 mEq/L is the same as 134 mmol/L. An ion that has a greater positive or negative charge; however, will have 1 mEq for each positive or negative charge of the ion for every 1 mmol. For example, for Ca+2, 2mEq/1mmol. If the standard range of Magnesium in the body is 0.70 to 0.95 mmol/L, convert this value into mEq/L for the Mg2+ ion. (Use dimensional analysis to figure this out)The substance to be analyzed – is white, highly soluble in water salt. When interacting with concentrated sulfuric acid – evolving of some gas with pungent odour can be observed. Reaction with zinc uranyl acetate leads to formation of yellow crystals, which have tetrahedral geometry. Interaction with water solution of silver nitrate leads to formation of white curdy precipitate, which soluble in saturated ammonium carbonate solution. What kind of salt is this? NaCl Na,SO3 NH4 NO3 KBrIbuprofen, widely used as a pain reliever, has limited solubility in water, less than 1 mg>mL. Which part of the molecule’s structure (gray, white, red) contributes to its water solubility? Which part of the molecule (gray, white, red) contributes to its water insolubility?
- When a hydrophobic substance like a hydrocarbon is dissolved in water, a clathrate cage of ordered water molecules is formed about it. If we consider only the effects on water, what do you expect the sign of ∆S to be for this process? Explain your answer.When 2.43 g of a nonelectrolyte solute is dissolved in water to make 435 mL of solution at 25 °C, the solution exerts an osmotic pressure of 895 torr. What is the molar concentration of the solution? concentration: 0.045 M Incorrect How many moles of solute are in the solution? moles of solute: 0.034 mol Incorrect What is the molar mass of the solute? molar mass: 69.12 g/mol IncorrectpH expresses the molar concentration of hydronium ions in an aqueous solution on a logarithmic scale. (Note that it is common to use the hydrogen ion, H*, to represent the hydronium ion, H3O+.) pH = -log[H3O+] [H3O+] = 10-PH As pH decreases, acidity increases. As pH increases, acidity decreases. • Acidic solution: pH 7 Part A - Calculating pH Submit [H₂0+] 1 Acidic pH 01 10¹ 102 103 104 105 106 107 108 109 10-10 10-11 10-12 10-13 10-14 stomach acid 3 wine lemon tomatoes juice vinegar, black soft drinks, coffee beer 6 Neutral urine milk 7 human blood pure water sea- water baking soda 10 11 12 13 14 milk of magnesia house- hold ammonia oven cleaner Basic household bleach Adapted from Biological Science by Freeman ©2008 Pearson Education, Inc. What is the pH of an aqueous solution with the hydronium ion concentration [H3O+] = 2 x 10-14 M? Make sure that your answer has the correct number of significant figures. For help determining the correct number of significant figures, see Hint 3. ►…
- An important buffer system in the human body involves carbon dioxide (CO2), carbonic acid (H2CO3), and bicarbonate ions (HCO3-) as shown: If a person becomes excited and exhales large amounts of CO2, how will his or her body’s pH be affected?A group of students designed an experiment to determine the impact of sucrose concentration on the weight of potato cubes. The pieces of potato were initially the same weight, shape, and size. Each potato piece was submerged into a beaker containing one of the sucrose concentrations for 30 minutes. The final weight of the potato was measured and recorded in the table. Which TWO conclusions can be correctly drawn from this data? A In the 0.4 mol/dm3 solution, the sucrose molecules moved across the semi-permeable membrane to go from a lower solute concentration (the potato) to a higher solute concentration (the sucrose solution), leading to a decrease in the weight of the potato. B In the 1 mol/dm3 solution, the water molecules moved across a semi-permeable membrane to go from a lower solute concentration (the potato) to a higher solute concentration(the sucrose solution), leading to a decrease in weight of the potato. C In the 0.8 mol/dm3 solution, the sucrose molecules moved…Based on how the water molecules are surrounding the two ions (labeled A&B), you can tell that (highlight or bold your response): lon A is (positive | negative | neutral) b. lon B is (positive | negative | neutral) If ions A and B were bonded together, what type of bond would they share? а. C.
- Which of the following positively-charged ions is about 10,000 times more concentrated outside the cell than inside (useful in muscle contraction, and in signal transduction of neurons)? bicarbonate chloride sodium calcium magnesiumif pH level of solution changes from pH 5 to pH 2, how much acidity increased in that solution and why?A solution at pH 7 is considered neutral because (a) its hydrogen ion concentration is 0 mol/L (b) its hydroxide ion concentration is 0 mol/L (c) the product of its hydrogen ion concentration and its hydroxide ion concentration is 0 mol/L (d) its hydrogen ion concentration is equal to its hydroxide ion concentration (e) it is nonpolar
