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I am Sara and I am living in Haifa.
I measured pH from  tap-water at my home. The water had a constant pH value for some days : pH=7.4
In the following picture you may get an impression on how I monitored pH value  by using tap water, litmus drops and pH color card .

Measurement accuracy is according to pH color card 0.4. 
It was interesting for me to pick out water pH values at home.
Enjoy your study.
Regards, Sara.