【单选题】计算 0.10mol × L -1 HCl 溶液和 0.10mol × L -1 NH 3 × H 2 O 溶液等体积混合后溶液的 c (NH 3 × H 2 O) 和 pH 值。( (NH 3 × H 2 O)=1.8 × 10 -5 )
A.
c (NH 3 × H 2 O)=5.3 × 10 -6 mol × L -1 , pH=5.28
B.
c (NH 3 × H 2 O)=5.3 × 10 -6 mol × L -1 , pH= 1
C.
c (NH 3 × H 2 O)= 0.1 mol × L -1 , pH=5.28
D.
c (NH 3 × H 2 O)= 0.1 mol × L -1 , pH= 1
【单选题】The overall length is necessary for a round end plate.
【单选题】欲配制 pH=7.21 的缓冲溶液,需在 0.10 mol × L -1 H 3 PO 4 500mL 溶液中加入 0.10 mol × L -1 NaOH 溶液的体积为 ( ) ( H 3 PO 4 的 p K a 1 =2.16 ; p K a 2 =7.21 ; p K a 3 =12.32 )
【判断题】The overall length is necessary for a round end plate.
【单选题】The overall length of gas pipeline was planned to reach 300,000 km--enough to ______ to the moon and back.
【单选题】The overall length of one full turn of the B-DNA helix is
【单选题】Choose the answer that the overall length is correct. (Single option: 1 0 points)
【单选题】下列溶液中能与 0.10 mol × L - 1 NaHCO 3 等体积混合配成缓冲溶液的是
C.
0.05 mol × L - 1 H 2 SO 4
【单选题】欲配制 pH=7.21 的缓冲溶液,需在 0.10 mol × L -1 H 3 PO 4 200mL 溶液中加入 0.10 mol × L -1 NaOH 溶液的体积为 ( ) ( H 3 PO 4 的 p K a 1 =2.16 ; p K a 2 =7.21 ; p K a 3 =12.32 )
【单选题】欲配制 pH=7.21 的缓冲溶液,需在 0.10 mol × L -1 H 3 PO 4 200mL 溶液中加入 0.10 mol × L -1 NaOH 溶液的体积为 ( ) ( H 3 PO 4 的 p K a 1 =2.16 ; p K a 2 =7.21 ; p K a 3 =12.32 )