@表山学花 省级精品课程申报 (1)What is the required buffer-component ratio? (2)How would you prepare this solution from stock solutions of 1.0 molL HCOOH and 1.0 mol L NaOH?[Hint:Mix x mL of HCOOH with (600-x)mL of NaOH.] (3)What is the final concentration of HCOOH in this solution? 注：stock solutions- 一贮备溶液，Hint—提示， 【解】() pH=pM+gCO0】 [HCOOH] 375=375+sC00 [HCOO-] [HCOOH] =1 (2)取400mL1.0 mol-L HC00H和200mL1.0moL1Na0H (3)0.333mol·L1HC00H 21.A buffer solution is made by adding 75g of sodium acetate to 500.0 mL of a 0.64 mol L solution of acetic acid.What is the pH of the final solution?(Assume no volume change.).pK(acetic acid)=4.76 【解】 PH=PK.(CH,COO) (CH,COOH) pH=4.76+g 75g÷82.0gmol- .64mol-L×0.50L pH=5.22 22.The pH of human blood is always close to 7.40.Calcilate the ratio of [HCO3]/COz]in blood at this pH.pKa [HCO3]=6.10 (37C) 【解】 PH=pK ICOz(a)+CO [C0,(aq)】 7.40=6.10+g0. [HCO] 5e·74-60-130