10ml alkaline water quality detection phenolphthalein indicator alkaline developer acid colorless
10ml alkaline water quality detection phenolphthalein indicator alkaline developer acid colorless
10ml alkaline water quality detection phenolphthalein indicator alkaline developer acid colorless
10ml alkaline water quality detection phenolphthalein indicator alkaline developer acid colorless
10ml alkaline water quality detection phenolphthalein indicator alkaline developer acid colorless

10ml alkaline water quality detection phenolphthalein indicator alkaline developer acid colorless

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10ml alkaline water quality detection phenolphthalein indicator alkaline developer acid colorless

About the product

Characteristic

Origin

Guangdong

Power supply voltage

See description

Resolution

See description

Item No.

ali-534482583106

Type

Water quality rapid analyzer

Brand

Other

Model

See description

Applicable industry

Hospital

Natatorium

Water plant Laboratory

Aquaculture Industry

Import or not

No

Measurement accuracy

See description

Measuring range

Alkaline detection

Customized processing

No

Picture

See description

Order Number

ali-534482583106

Test items

Heavy metal

Description

 













酚酞是一种弱有机酸,在pH<8.2的溶液里为无色的内酯式结构,当8.2醌式结构。

酚酞的变色范围是 8.2 ~ 10.0,所以酚酞只能检验碱而不能检验酸。 (浅红色)(红色)

酚酞作为一种常用指示剂,广泛使用于酸碱滴定过程中。通常情况下酚酞遇酸溶液不变色,遇中性溶液也不变色,遇碱溶液变红色。然而,酚酞在强碱中由红色迅速退为无色,而在浓酸中也会变色,在稀酸溶液中酚酞滴加过量造成沉淀,使溶液变成白色浑浊。(这是由于酒精易溶于水,使试剂中难溶于水的酚酞析出的缘故。)酚酞的醌式或醌式酸盐,在碱性介质中很不稳定,它会慢慢地转化成无色羧酸盐式;遇到较浓的碱液,会立即转变成无色的羧酸盐式。所以,酚酞试剂滴入浓碱液时,酚酞开始变红,很快红色退去变成无色。酚酞遇浓硫酸变橙色

使用方法:

1,用法与用量:将本试剂滴3-4滴于50ml被测溶液中摇匀,根据被测 溶液的颜色变化,颜色变红为碱性。
2,【贮藏】避光,密封在室温阴凉处,
3,【有效期】三年

Characters

Properties

Origin

Guangdong

Power supply voltage

See description

Resolution

See description

Item No.

ali-534482583106

Description

 













酚酞是一种弱有机酸,在pH<8.2的溶液里为无色的内酯式结构,当8.2醌式结构。

酚酞的变色范围是 8.2 ~ 10.0,所以酚酞只能检验碱而不能检验酸。 (浅红色)(红色)

酚酞作为一种常用指示剂,广泛使用于酸碱滴定过程中。通常情况下酚酞遇酸溶液不变色,遇中性溶液也不变色,遇碱溶液变红色。然而,酚酞在强碱中由红色迅速退为无色,而在浓酸中也会变色,在稀酸溶液中酚酞滴加过量造成沉淀,使溶液变成白色浑浊。(这是由于酒精易溶于水,使试剂中难溶于水的酚酞析出的缘故。)酚酞的醌式或醌式酸盐,在碱性介质中很不稳定,它会慢慢地转化成无色羧酸盐式;遇到较浓的碱液,会立即转变成无色的羧酸盐式。所以,酚酞试剂滴入浓碱液时,酚酞开始变红,很快红色退去变成无色。酚酞遇浓硫酸变橙色

使用方法:

1,用法与用量:将本试剂滴3-4滴于50ml被测溶液中摇匀,根据被测 溶液的颜色变化,颜色变红为碱性。
2,【贮藏】避光,密封在室温阴凉处,
3,【有效期】三年

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