PH for liquid dishwash - Chemists Corner

General

PH for liquid dishwash

Posted by Anonymous on February 27, 2019 at 4:24 am

hi any body help me regarding best PH level for liquid dishwash in both summers and winter?

Aziz replied 5 years, 6 months ago 5 Members · 8 Replies
8 Replies

Fekher

Member
February 27, 2019 at 1:04 pm

@Mrkhan i think slighty basic will be the best between 7 and 8 .
Aziz

Member
February 28, 2019 at 1:26 am

Fekher said:

@Mrkhan i think slighty basic will be the best between 7 and 8 .

May it be between 8 to 10 ? 7 is neutral , will with that pH dish wash work fine ?
Fekher

Member
February 28, 2019 at 11:06 am

@Aziz even lower then 7 can work if level of surfctants is good . For ph higher then 8 it can cause irritation for hands.
Aziz

Member
February 28, 2019 at 4:45 pm

Fekher said:

@Aziz even lower then 7 can work if level of surfctants is good . For ph higher then 8 it can cause irritation for hands.

Yes , I am agree with you . Cleaning criteria does not decided by pH , it is decided by ingredients used in it . For dish wash recomended pH is 8 to 10.. Yesterday I mades a batch and it’s pH was 8.1 My choice is 8 to 9 .
chemicalmatt

Member
February 28, 2019 at 8:58 pm

Any hard surface cleaner, which includes liquid dishwash, will be best at pH>9.0 Irritation doesn’t occur until you get into the pH 12 range, remember how dilute the working liquid is. Also, cleaning criteria can be a function of pH, I do not agree with Aziz there. Saponified systems will clean MUCH better at pH 11 than at pH 8.
Leduyhoang2987

Member
March 5, 2019 at 11:47 pm

I think PH=6 is best, because my hand skin’s PH =5.5. Some time we wash aqua (=7) which even make hand dry.
belassi

Member
March 6, 2019 at 1:06 am

If I wanted to answer this question, I would bring my pH meter from the lab and measure the one I buy at the supermarket.
Aziz

Member
March 10, 2019 at 12:51 pm

chemicalmatt said:

Any hard surface cleaner, which includes liquid dishwash, will be best at pH>9.0 Irritation doesn’t occur until you get into the pH 12 range, remember how dilute the working liquid is. Also, cleaning criteria can be a function of pH, I do not agree with Aziz there. Saponified systems will clean MUCH better at pH 11 than at pH 8.

Hi , With the increase of pH cleaning power increase . That does not mean you can formulate with only a 2 to 5% NaOH , which has a very high pH . You can’t make a dish washing liquid with it though it has a very high pH . The criteria of your formulation will be decided by the ingredients you use in it , not only by pH alone , though a higher pH clearly increase the cleaning power . That is my point .