AR级别，即分析纯级别，是化学试剂纯度的一种标准，要求杂质含量极低，确保在准确的科学实验中不产生干扰。高纯度的Tris-HCl意味着需要采用更为复杂的提纯工艺，如多次重结晶、离子交换层析等，以祛除可能存在的金属离子、有机杂质等，这些步骤增加了生产成本 ...

If the hydrogen ion concentration in a solution increases by a factor of 10, the pH of the solution decreases by 1. A solution of 1 g/dm 3. hydrochloric acid has a pH of 1.6. Predict its pH when ...

The Wipro stock is expensive at 21 times FY2026 earnings and trades at just 6-9 per cent discount to Infosys Ltd and HCL Technologies Ltd despite significantly weaker fundamentals. "We expect ...