【单选题】If solutions of calcium iodide and ammonium chloride are mixed together in a metathesis reaction, what is the empirical formula for the precipitate which forms ?
【简答题】Calculate the approximate pH value of different solutions below ; (1) A 0.10 M HAc K a (HAc)=1.8×10 -5 (2) A 0.10 M NH 4 Cl K b (NH 3 )= 1.8×10 -5 (3) A mixture solution with 0.05 M NaHCO 3 (50 mL...
【简答题】What volume of 0.1mol/L hydrochloric acid solution should be added to 50 mLof the following solutions respectively to prepare solution at pH =7.00? (1) 0.1mol/L NaOH solution. (2) 0.1 mol/L NH3 soluti...
【简答题】计算下列波形的幅度和频率 ( 经探头接入 ) : ( 1 ) V / div 位于 0.2 档, t / div 位于 2 μ s 档。 1 H = 2div , D = 3div 2 H = 5div , D = 2div . 3 H = 3div , D = 5div ( 2 ) V / div 位于 0.05 档, t / div 位于 50 μ s 档。 1 H = 5div , D = ...
【单选题】If the following solutions are at the same concentration of 0.1 mol · L -1 , which is the correct ordering of their pH value? ( Ka( HAC )=1.75 × 10 -5 , Ka( HF )=6.8 × 10 -4 , Ka( HCN )=6.2 × 10 -10 )