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In lab, scientists often use percentages to describe concentration. When making a solution, percentage can be expressed as weight over volume (wt/vol) or as weight over weight (wt/wt). When expressing things as %(wt/wy it usually assumed that 1 mL of water = 1 gram of water. This is similar to assuming molarity (mol/L) equals molality (mol/kg) order to produce a final In lab, 70%(wt/vol) ethanol is frequently used to sanitize the lab pench or research tools such as forceps. volume of 200 mL of 70%(wt/vol) ethanol, how many ml of 99%(wt/vol) ethanol would you need to add? The percentages can be treated as a concentration. A solution that is 70% ethanol is 70 g of ethanol and 30 mL of water, or 70 g Ethanol out of 100 mL of solution. Therefore, it is possible to use m,v = m,v2 and use the percentages as the concentration values. Report your answer rounded to two decimal places

In lab, scientists often use percentages to describe concentration. When making a solution, percentage can be expressed as weight over volume (wt/vol) or as weight over weight (wt/wt). When expressing things as %(wt/wy it usually assumed that 1 mL of water = 1 gram of water. This is similar to assuming molarity (mol/L) equals molality (mol/kg) order to produce a final In lab, 70%(wt/vol) ethanol is frequently used to sanitize the lab pench or research tools such as forceps. volume of 200 mL of 70%(wt/vol) ethanol, how many ml of 99%(wt/vol) ethanol would you need to add? The percentages can be treated as a concentration. A solution that is 70% ethanol is 70 g of ethanol and 30 mL of water, or 70 g Ethanol out of 100 mL of solution. Therefore, it is possible to use m,v = m,v2 and use the percentages as the concentration values. Report your answer rounded to two decimal places

Chemistry & Chemical Reactivity
Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter1: Basic Concepts Of Chemistry
Section: Chapter Questions
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In lab, scientists often use percentages to describe concentration. When making a solution, percentage can be expressed as weight over volume (wt/vol) or as weight over weight (wt/wt). When expressing things as %(wt/w) it usually assumed that 1 mL of water = 1 gram of water. This is similar to assuming molarity (mol/L) equals molality (mol/kg) In lab, 70%(wt/vol) ethanol is frequently used to sanitize the lab þench or research tools such as forceps. In order to produce a final volume of 200 mL of 70%(wtvol) ethanol, how many mL of 99%(wt/vol) ethanol would you need to add? The percentages can be treated as a concentration. A solution that is 70% ethanol is 70 g of ethanol and 30 mL of water, or 70 g Ethanol out of 100 mL of solution. Therefore, it is possible to use m,v, = m,v2 and use the percentages as the concentration values. Report your answer rounded to two decimal places
Transcribed Image Text:In lab, scientists often use percentages to describe concentration. When making a solution, percentage can be expressed as weight over volume (wt/vol) or as weight over weight (wt/wt). When expressing things as %(wt/w) it usually assumed that 1 mL of water = 1 gram of water. This is similar to assuming molarity (mol/L) equals molality (mol/kg) In lab, 70%(wt/vol) ethanol is frequently used to sanitize the lab þench or research tools such as forceps. In order to produce a final volume of 200 mL of 70%(wtvol) ethanol, how many mL of 99%(wt/vol) ethanol would you need to add? The percentages can be treated as a concentration. A solution that is 70% ethanol is 70 g of ethanol and 30 mL of water, or 70 g Ethanol out of 100 mL of solution. Therefore, it is possible to use m,v, = m,v2 and use the percentages as the concentration values. Report your answer rounded to two decimal places
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