0
question_answer1) A buffer with pH 9 is to be prepared by mixing \[N{{H}_{4}}Cl\] and \[N{{H}_{4}}OH\]. Calculate the number of mole of \[N{{H}_{4}}Cl\] that should be added to one litre of 1 M\[N{{H}_{4}}OH\]. \[\left( {{K}_{b}}=1.8\times {{10}^{-5}} \right)\]
question_answer2) Fluoroacetic acid has a \[{{K}_{a}}\] of \[2.6\times {{10}^{-3}}\]. What concentration of the acid is needed so that \[[{{H}^{+}}]\]is \[2.0\times {{10}^{-3}}\] ? If concentration of the acid is \[x\times {{10}^{-3}}\] value of x is-
question_answer3) Ionization constant of acetic acid and ionic product of water at \[25{}^\circ C\] are respectively \[1.75\times {{10}^{-5}}\] and \[1\times {{10}^{-4}}\] respectively. Calculate the hydrolysis constant of sodium acetate and its degree of hydrolysis in \[{{10}^{-3}}M\] solution. What will be the pH of the solution?
question_answer4) 560 ml of HCl gas measured at STP is added to a 500 ml solution of 0.01 M NaOH. Calculate pH of resulting solution. \[\left( log\,2=0.3 \right)\] Give your answer by multiplying 5.
question_answer5) 10 ml of 0.2 M \[{{H}_{2}}S{{O}_{4}}\] is mixed with 20 ml of 0.2 M \[Ba{{\left( OH \right)}_{2}}\] solution, the solution obtained is filtered and the obtained solution after filtering is reacted with some of 20 ml of 0.2 M \[C{{H}_{3}}COOH\]solution. Calculate pH of final solution. Give your answer in next integer. (Given \[p{{K}_{{{a}_{C{{H}_{3}}COOH}}}}=4.74\])
question_answer6) Calculate the amount of \[{{\left( N{{H}_{4}} \right)}_{2}}S{{O}_{4}}\] in grams which must be added to 500 ml of 0.2 M \[N{{H}_{3}}\] to yield a solution of pH = 9.3. Given \[p{{K}_{b}}\] for\[N{{H}_{3}}=4.7\]. Give your answer by dividing 3.3
question_answer7) What of \[Mg{{(OH)}_{2}}\] and \[Al{{(OH)}_{3}}\] in 1 litre. Their saturated solution (\[{{K}_{SP}}\] of \[Mg{{\left( OH \right)}_{2}}=4\times {{10}^{-12}}\] and \[{{K}_{sp}}\] of \[Al{{\left( OH \right)}_{3}}=1\times {{10}^{-33}}\]) give answer by multiplying it with by \[{{10}^{-17}}\]
question_answer8) In a solution of \[{{10}^{-7}}M\] NaOH calculate pH of the solution.
question_answer9) 500 ml of \[{{10}^{-5}}M\] NaOH is mixed with 500 ml of\[2.5\times {{10}^{-5}}M\]\[Ba{{\left( OH \right)}_{2}}\]. Calculate pH. \[(Given\text{ }log\,3=0.47)\]
question_answer10) Calculate pH of a solution obtained by mixing equal volume of 0.02 M HOCl and 0.2 M \[C{{H}_{3}}COOH\] solution. Given that \[K{{a}_{HOCl}}=2\times {{10}^{-4}},\] \[K{{a}_{C{{H}_{3}}COOH}}\]\[=2\times {{10}^{-5}}\]
question_answer11) Amongst the following, the total number of compounds whose aqueous solution turns red litmus paper blue is -\[KCN,{{K}_{2}}S{{O}_{4}},{{\left( N{{H}_{4}} \right)}_{2}}{{C}_{2}}{{O}_{4}},\]\[NaCl,Zn{{\left( N{{O}_{3}} \right)}_{2}},FeC{{l}_{3}},{{K}_{2}}C{{O}_{3}},N{{H}_{4}}N{{O}_{3}},LiCN\]
question_answer12) The total number of diprotic acids among the following is - \[{{H}_{3}}P{{O}_{4}},{{H}_{2}}S{{O}_{4}},{{H}_{3}}P{{O}_{3}},{{H}_{2}}C{{O}_{3}},{{H}_{2}}{{S}_{2}}{{O}_{7}},{{H}_{3}}B{{O}_{3}},\]\[{{H}_{3}}P{{O}_{2}},{{H}_{2}}Cr{{O}_{4}},{{H}_{2}}S{{O}_{3}}\]
question_answer13) The solubility of \[Mg{{\left( OH \right)}_{2}}\] in pure water is\[9.75\times {{10}^{-3}}g/L\] . Calculate its solubility (in g/L) in 0.02 M \[Mg{{\left( N{{O}_{3}} \right)}_{2}}\] solution. Give your answer\[x\times {{10}^{-4}}g/lit\] .
question_answer14) Calculate the pH of an aqueous solution of 1.0 M ammonium formate assuming complete dissociation. (\[p{{K}_{a}}\] of formic acid = 3.8 and \[p{{K}_{b}}\]of ammonia = 4.80).
question_answer15) What is the pH of 0.50 M aqueous NaCN solution? \[p{{K}_{b}}\] of \[C{{N}^{-}}\] is 4.70.
Please Wait you are being redirected....
You need to login to perform this action.You will be redirected in 3 sec
OTP has been sent to your mobile number and is valid for one hour
Your mobile number is verified.