(1)配制50g溶质质量分数为5%的氢氧化钠溶液。用天平称取_____g的氢氧化钠,放入烧杯中,用_____(填仪器名称)量取(水的密度为1g/cm3)_____mL水,加入上述烧杯中,搅拌,完全溶解,备用。
(2)如图所示,硫燃烧后,用针筒将所配制的NaOH溶液注入集气瓶中。若集气瓶中生成0.32g的二氧化硫,将其完全吸收,针筒要吸取氢氧化钠溶液的质量为________?(假设 NaOH 溶液吸收SO2时只发生如下反应:SO2+2NaOH=Na2SO3+H2O)
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2