容量瓶Volumetric flask

配制溶液步骤：计算 → 称量（或量取）→ 在烧杯中溶解并冷却至室温 → 用玻璃棒引流转移入容量瓶 → 用少量溶剂洗涤烧杯和玻璃棒 2–3 次，洗液一并转入 → 加溶剂至距标线 1–2 cm 处 → 改用胶头滴管滴加至弯月面最低点与标线相切 → 盖塞，反复倒转摇匀。

To make a solution: calculate → weigh or measure → dissolve in a beaker and cool to room temperature → transfer down a glass rod into the flask → rinse beaker and rod two or three times with a little solvent and add the rinsings → add solvent to 1–2 cm below the mark → finish dropwise with a dropper until the bottom of the meniscus meets the mark → stopper and invert repeatedly to mix.

容量瓶是“量入式”量器，刻度在 20 °C 校准，不能加热、不能在其中溶解固体或进行反应（溶解热会改变体积），不能长期储存溶液（尤其是碱液，会腐蚀玻璃使瓶塞粘住）。使用前须检查瓶塞是否漏水。定容时若超过标线，只能重新配制。

Volumetric flasks are calibrated to contain at 20 °C; never heat them, dissolve solids or run reactions in them (heats of solution change the volume), or store solutions in them long-term, especially alkalis, which etch the glass and seize the stopper. Check the stopper for leaks before use, and if you overshoot the mark, start again.

A 级 100 mL 容量瓶允差 ±0.10 mL，250 mL 为 ±0.15 mL。分析化学中常用容量瓶配制标准溶液和进行准确稀释，配合移液管使用。

A class-A 100 mL flask is accurate to ±0.10 mL and a 250 mL flask to ±0.15 mL. In analytical chemistry volumetric flasks are used with pipettes to prepare standard solutions and make accurate dilutions.