已知硼砂的构成为Na2[B4O5(OH)4]·8H2O,其阴离子的结构如图所示。下列说法错误的是( )。 A. 硼砂中含有氢键 B. 硼砂中B原子均采用sp2杂化 C.
硼砂[Na2B4O5(OH)4•8H2O]水溶液常用于pH计的校准。硼砂水解生成等物质的量的B(OH)3(硼酸)和Na[B(OH)4](硼酸钠)。已知:①25℃时,硼酸显
由Sodium Tetraborate Octahydrate- Na2B4O5(OH)4·8H2O组成 元素标志原子质量原子#质量百分比 鈉Na45.9795 g/mol212.0563% 硼B43.244 g/mol411.3391% 氧O271.9898 g/mol1771.3187% 氫H20.1588 g/mol205.2859% Sodium Tetraborate Octahydrate 元素 质量百分比氧271.99g氧271.99g鈉45.9795g鈉45.9795g硼43.244g硼43.244g...
Practice Balancing Na2(B4O5(OH)4)·8H2O-++H2SO4-+ = Na2SO4-++B2O3-++H2O-+ ReactantsProducts Na22✔️ B42❌ O218❌ H222❌ S11✔️ Hint: The sum of the balanced coefficients is 16.See Step-By-Step Solution
Na-O bond lengths were isotropically expanded with increasing temperature, whereas the B-O bond lengths and angles remained unchanged even after the phase transition to tincalconite. Molecular orbital calculations revealed that an electron cloud shared by two borate tetrahedra led to the formation of ...
答案:(1)23(2)A(3)BN B4C3(4)①锂铍铝CNaB②d 结果二 题目 15.(17分)硼砂的化学式为Na2[B1O5(OH)]·8H2O,是一种既软又轻的无色结晶物质。回答下列问题(1)硼砂中含有2种第二周期元素,硼砂中所含元素分布在周期表3个主族。(2)在周期表中,硼附近的元素有铍、碳、铝、镁、硅等。下列相关性...
答案:Mg(OH)2、Fe2O3 (2) 反应物NaB(OH)4和过量CO2,生成物Na2B4O5(OH)4·8H2O和碳酸氢钠,化学方程式为4NaB(OH)4+2CO2+3H2O=Na2B4O5(OH)4▪8H2O↓+2NaHCO3; 答案:4NaB(OH)4+2CO2+3H2O=Na2B4O5(OH)4▪8H2O↓+2NaHCO3 (3)检验H3BO3晶体洗涤干净的操作是取最后一次洗涤液少许...
答案:Mg(OH)2、Fe2O3 (2)反应物NaB(OH)4和过量CO2,生成物Na2B4O5(OH)4·8H2O和碳酸氢钠,化学方程式为4NaB(OH)4+2CO2+3H2O=Na2B4O5(OH)48H2O↓+2NaHCO3; 答案:4NaB(OH)4+2CO2+3H2O=Na2B4O5(OH)48H2O↓+2NaHCO3 (3)检验H3BO3晶体洗涤干净的操作是取最后一次洗涤液少许于试管中,滴加硝酸...
NaOH + NO = NaNO2 + H2O + N Fe2(SO4)3 + NaF = F3Fe + Na2O4S C2H4O2 + NaOH = C2H3NaO2 + H2O + C2H4O2 Ca(HCO3)2 + C17H35COOK = CHKO3 + (C17H35COO)2Ca 近期平衡的方程式 練習 Na2B4O5(OH)4·8H2O-++H2SO4-++CH4O-+ ...
Na2B4O5(OH)4·8H2O1381.37213856 NaOH239.99710928 产品 偏硼酸钠水 NaBO2465.79956928 H2O1118.01528 这个计算器将确定反应的限制试剂。 Instructions To calculate the limiting reagent, enter an equation of a chemical reaction and press the Start button. The reactants and products, along with ...