In neutral water at #298*K#, the following equilibrium operates: Show
#2H_2O(l) rightleftharpoons H_3O^+ + HO^-# Careful measurement has established that at #298*K#, the ion product, #[H_3O^+][""^(-)OH]=10^(-14)#. If the solution is neutral then, #[H_3O^+]=[""^(-)OH]=10^(-7)mol*L^-1#. If #[H_3O^+]<[""^(-)OH]#, then the solution is alkaline, and if #[H_3O^+]>[""^(-)OH]#, then the solution is acidic. We can go a step farther than this, and define #pH# and #pOH#. If we take #-log_10# of both sides of the equation,#[H_3O^+][""^(-)OH]=10^(-14)#, we get #-log_10[H_3O^+]-log_10[""^(-)OH]=-14#. If we define #pH=-log_10[H_3O^+]# and #pOH=-log_10[""^(-)OH]#, then, #pH + pOH =14.# From above, at neutrality, #pH = pOH =7#; i.e. #[H_3O^+]# and #[HO^-]# are EQUAL. Upgrade to remove ads Only A$47.99/year
Terms in this set (10)Substances of acidic or alkaline nature dissolve in water and/or contain: a) salt A solution that has more positive hydrogen ions than negative hydroxide ions is: a)
acidic (correct) When a solution has an equal number of hydrogen and hydroxide ions, the solution is considered: a) acidic Distilled water with a pH of 7 is considered: a) a salt On the pH scale, numbers less than 7 indicate a(n): a) acidic solution (correct) On the pH scale, numbers greater than 7 indicate a(n): a) acidic solution A pH of 5 is how many more times acidic than a pH of 6? a) 1.5 The most accurate method of measuring pH is with: a) a pH meter (correct) What is the pH range of hair, skin and nails? a) 4.5 to 5.5 (correct) pH balanced refers to a product that ranges from a pH of: a) 4.5 to 5.5 (correct) Students also viewed102.721 terms codie_madison 102.0710 terms christina_matlock 102.927 terms codie_madison 102.0910 terms christina_matlock Sets found in the same folder103.25 terms beautybyvictoria18 102.0910 terms christina_matlock 103.35 terms beautybyvictoria18 102.927 terms codie_madison Other sets by this creatorMaster Mock Quizzes (wrong)65 terms beautybyvictoria18 Milady Mock State Board Test Cosmetology79 terms beautybyvictoria18 Cosmetology Mock State Board (1)100 terms beautybyvictoria18 Milady Comprehensive Test130 terms beautybyvictoria18 Recommended textbook solutionsOrganic Chemistry3rd EditionDavid Klein 3,013 solutions Chemistry for Engineering Students2nd EditionLawrence S. Brown, Thomas A. Holme 945 solutions Quantitative Chemical Analysis8th EditionDaniel C. Harris 921 solutions Principles of Environmental Chemistry3rd EditionJames Girard 371 solutions Other Quizlet setsFinal Exam Review IPC31 terms webberm Grenfeld Test 5 Ch.16 & Ch.1330 terms kjcc1 Chem exam 128 terms jackie_minor Study Guide-Biology I Test165 terms Morgan_Lewis06 What solution contains more hydroxide ions than hydrogen ions?A basic solution contains more hydroxide ions than hydrogen ions.
What is a solution called when it contains more hydrogen ions H +) than hydroxide ions OHNumber of hydrogen ions precisely equals the number of hydroxide ions (OH–) And the solution is neutral - Neither acidic or basic. Pure water has a neutral pH of 7, or 10-7 mol/liter (0.0000001 mol/liter) of hydrogen ions. A solution with a pH below 7, is acidic. There are more hydrogen ions than hydroxide ions.
Which solution has the greatest number of hydrogen ions?An acidic solution has a high concentration of hydrogen ions (H +start superscript, plus, end superscript), greater than that of pure water. A basic solution has a low H +start superscript, plus, end superscript concentration, less than that of pure water.
When the concentration of hydrogen ions is greater than the concentration of hydroxide ions The solution is considered an acid?Any aqueous solution in which [H+]=[OH−] is said to be neutral. For any neutral solution at 25oC, each of these ions has a concentration of 1.0×10−7M. An acidic solution is a solution in which the concentration of hydrogen ions is greater than the concentration of hydroxide ions.
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